Honda CR-V Owners Club Forums banner
Status
Not open for further replies.

how to test fuel pump,

1 reading
11K views 19 replies 5 participants last post by  rebuilder86  
#1 ·
So im in Cebu philippines, with a 2003 CRV,
We just had a massive typhoon and fuel supplies became an issue and all hell broke loose, and i used my car as a source of gasolone for all my employees, we are a telco and are responsible for keeping all the hospitals government departments and agencies and large business internet connections online in the city, so my car became the source of gasoline in order to maek our technicians mobile via motorcycle. it was so crucial that i just had no choice but to abuse my poor CRVs fuel pump a bit.
Because you cant syphon from these vehicles, i removed the fuel hose from the rail and used the fuel pump to fill jerry cans to fill the guys motorcycles. this worked for about 20L, but then it slowed down and reduced to a trickle. i was quite sure i had plenty of gasoine in the tank, so i just stopped plugged it al back in and the car wouldn't start. I figured id jsut fried the fuel pump so i wrote it off and continued my other tasks, like keeping our data centre and fiber distribution netowrk up and running

I removed the pump from the tank and then just looked at things in despair and gave up.

Now im just lost.

The pump measures 1.2 ohms across its terminals, which according to the net is about right.
It makes noise, and it pisses out a tiny bit of fuel out the hose, but it wont start.

A new pump is an option, but its stupidly expensive and im not willing to do that unless i know its broken.
Today i had an other look and stuck my head in the bacm and looked into the tank and found it was bone dry. I couldnt work out if thats becasue i drained it the other day or if it evaporated through the open fuel cap. SO i went and got 20L, stuck it in, confirme on the gauge, primed a few times but stil nothing. Pulled the hose off and yeh still, nothing coming out,. Its making noise, butjsut no flow and no pressure.

What have i done., i cant think straight because we are all mallnutritioned and having domestic arguments and fighitng and its just a disaaster.

I have fuel in the tank, i have noises coming from pump, but i have no fuel flow whatsoever.

alll of this, the caar is parked away in a tiny tight garage wiht a meer 1 foot access on one sdie of the vehicle, uive been leanign over the drivers seat to the rear seat to access teh fuel pump.
 
#2 ·
Wow, I hope you get it solved soon. I’m sorry for your troubles. Best wishes to you.
 
Save
#3 · (Edited)
can doing what i did clog a fuel filter so bad that it stops all flow?? like, the speed at which the fuel was flowing through the system into a can, could that perhasps cause gunk in tehe tank to stir up and clog the fuel filter? I just went into honda to ask for help, and they said they cant do anythign unlesss i tow the car there. a white man getting a car towed to a dealership here would result in said white man loosing all his life savings. so thats not an option. it would be like all their christmases had come at once, theyd take every centavo i have saved.

its just a fuel pump. what is going on, why is there no relay, why does it make sound wiht no fuel coming out. did i simply burn it out in such a way that the motor spins and the impeller doesnt?


after they told me they couldnt help i asked how much a fuel pump woudl cost from them, andi honetly stareted crying like an insane psychopath, when they said 27 thousand pesos. Thats 530 USD for just the metal cylindrical pump bit. does that sound right?
I thouht i was being scammedat the parts store this morning when they tried to charge me 4k pesos for one. i thought that was too much and came home and started doing all kinds of tests, to no avail, everythign checks out good, noises when there are suppsed to be, fuel pump motors coil resistance checks out good at 1.2 ohms, has fuel in the tank,

i didnt make any stupid mistake, the fuel pump runs constantly while the engine is running, so how did me tricking it to run by flicking on and off to make it do the start prime cycle, how did i make it burn out? is it posibel that the pump draws a lot of current to start, and i made it do that too many times in a short amount of time?
Doenst help that the previous owner and his wonderful mechanical genius friends wound a wire around the fuel pump fuse( under the dash) in order to repair a broken fuse. IDIOTS,
 
#4 ·
FIRST OF ALL: Kudos for helping your workers maintain the infrastructure! :giggle:



Its possible that the pick-up in the tank is somewhat clogged by debris. Have you been able to pull the pump to inspect?

The pumps DO require a quantity of fuel surrounding them to prevent overheating. But we have driven our '06 for several 14 - 15 hour trips without incident. We don't let it get less than 2 gallons from empty tho'.
 
  • Like
Reactions: UK-Kev
Save
#5 ·
ive had the whole pump assembly out, its different form the US model, this is what it looks like.

THe filter screen looks fine, and i can see gasoline in the upper filter part, its just not doing much,.


SO the reason i havent just bought a apump, is the insane replacement cost, plus the fact that i cant see how it could be broken when the ophms reading of the pump is within spec and its making a nice whirring noise when i turn ignition on.. if it was burned out, i would suspect that surely that ohms reading would be somethign worse thatn what the internet telles me fuel pumps should read (0.2-3 phms). mine is reading 1.2 ohms.. that plus the fact that the fuse hase been hard wired acros makes me think, if something did get over current, it could be anywhere.Ive just got no idea where to look.


The pumps makign noise and it pushed a tiny bit of fuel out. is there anything other than the pump or its electrical electrical supply that could have changed behavior? there is a little valve thing on the fuel pump assembly with a wire going to the negatvie connection, what does that do? could that simply be buggered? it looks like some kind of pressure releive valve, and my brain wants to convince me that that is just stuck open from my silly buggers, or something like that.
 
#6 ·
i cant see how it could be broken when the ohms reading of the pump is within spec and its making a nice whirring noise when i turn ignition on..
Don't confuse the electrical part (motor) with the mechanical part (pump)

As stated, the motor might run but the pump isn't clear to 'push' the fuel. Have you verified that the Strainer Case in your link passes fuel?



That said, I haven't needed to gain FP experience with ANY of our Hondas over the years.
 
  • Like
Reactions: handycrowd
Save
#7 ·
I guessi jsut feel that its such a simple impeller design, that if i can hear it whirring, it must be spinning somethign large, and the only large bit, is the impeller blades.

strainer case meaning, what, the first sack filter bit?
Not really sure how to do that,but ive held it in my hands and its not clogged.

It stopped flowing fast after about 20 minutes of key cyling between acc and on,rapid cycles in order to save time. It felt like i broke somethign electrical, it happened quite suddenly.
IS it possible that the PGM-FI relay can half die? like still let current through but not enough to spin propperly?

Ive jsut got too many questions andI cant put them all in one post coz my brain is fried
 
#8 ·
ive been trying to fine a way to do a voltage drp test, but there is no way to back probe the fuel pump because, stupid honda design, is overprotective, and the connector teminates into waterproof wireing connector. how has anyone done a voltage drop test to the fuel pump
 
#10 ·
so im not certain, because im not taking it all apart again, but it seems that you cant test fuel pumps using the ohms test. Mine tested ok, but i jsut send my brother in law in to a local shop ( so they couldt see me) and he got one for a 20th of the price I was quoted, so i tried it, and it didnt work, but then i took it all apart and reassembled it and it bounced into life, but now it runs terribly and stalls. I pull the dipstick, and somehow it seems as if the oil has been contaminated, not milkshakey, but contaminated and bubbly. Perhaps this is from being left sitting for weeks since i killed it, absorbing the humid air through the air intake into the crankcase breather, perhaps leading to the oil becoming randomly spotchy viscous ruining the stupidly needlessly overcomplicated VTC system wiht its stupid actuator.
So I jsut give up, I think its just that the honda crv needs its very particular fuel pump or else it cant make the perfectly required fuel pressure.. whatever we got was just a "LOOKS LIEK IT FITS' type of thing. it has no power, keeps stalling, and idles terribly, and i drove it straight to honda with the aim of leaving in their hands (dumping it on them) if its uneconomical to repair. Im just gutted at how complciated this vehicles has been since day one.
Im just spent, this vehicle has been nothign but sanity loosing mind numbing disaster.
Ive rebuilt and owned about 20 second hand vehicles from 1980s era to 2010s, since i was 15 ( now 36) adn this has been the most hassle of any vehcile ever.
 
#11 ·
Image
Image

If your CRV is a KZ then it was probably built in Thailand. The Fuel Pump Set is different to all other markets in that model year.
The aperture in the fuel tank is smaller and there are 2 ports on the pump assembly rather than 1
Price from Honda Thailand is 10855 Thai Baht and I cannot find an aftermarket source but...
The actual fuel pump is a generic part and you can buy from Lazada Philippines for around 20 USD
When fitting the pump to the assembly take care that the 2 rubber seals marked 33 above are seated correctly or you will not get full fuel pressure.
Replacement pump from Lazada comes with a new filter so that may also help.

I do hope you succeed in correcting the issue. When you do fix it you can remove fuel by way of the drain plug at the bottom of the tank which I think is unique to the KZ model and save over working the fuel pump.

Good luck and continue the good community work.
 
#12 ·
yeh thats the one,. KZ, thai model, but im quite sure they actualy build it here in PH. and yes, informaton is difficult because its the only one with this stupid fuel pump.
10855 Thai Baht, thats 16k pesos, honda want 27k here for just the metal pump. Its NOT MORE FUN in the philippines, its not cheap to live here, they drip feed you to empty your wallet for everything. Im sure you dont get it quite as bad over there in thailand :p.

Quote :"When fitting the pump to the assembly take care that the 2 rubber seals marked 33 above are seated correctly or you will not get full fuel pressure"
This sir, you are on the money, i think when i got the new cheap pump and reassembled it, I think perhaps i first installed it poorly as you say, and maybe the second time it seated propperly.

So it started, but now, everything else is totally stuffed, its got a errible idle, and, for some reason, now the oil seems to appear to be contaminated. Im trying to work out if perhaps the fuel pressure is now so great from using a random generic pump., that maybe the computer hasnt relearned what "real fuel pressure" looks like, or maybe its so powerfull now, too powerfull, now that it doesnt matter the injector pulse cant be short enough to put the right amount of fuel in. It does seem like a rich idle, i have lots experience with carbi cars, and this bad idle and lack of power down low feels like its just dumping fuel in, but it could just be that now the oil is somehow contaminated. Hell it could be contaminuated with fuel from such a stupidly rich mixture the first time it managed to start, probably filled the cylinders and seeped past the rings.

i dont know, im grasping at answers as to how my fuel pump issues could causemy oil to become wierd.
 
#13 ·
Sounds like you have had a rough number of weeks, and the car has too. Just put in fresh oil, fresh fuel, reset the computer, check the air filter, then do the same for the car ;)
Give it a chance before you give up. You have come too far. Hope you work it out soon!
 
Save
#14 ·
So to recap, the fuel pump was run down to where there was no fuel left in the tank. These fuel pumps require a small amount of fuel around it to act as a cooling agent. Then you also had the engine going for a time?? Makes me think the fuel injectors were running without fuel? Which could mean the injectors are burnt out?? Do not know for sure cause do not know how you rigged it up to pump fuel for others to use. Was going to ask if the engine would start with starter fluid. This would confirm a fuel issue. Well, good luck with your new project.
 
#15 ·
se avisitor, im not even sure if it ran out of fuel.
THe night after the typhoon, we drove a logn distance and found an open gas station runing on genset! so i filled up cmpletely, 60 litres.
THen drove home about 70 km.

So i estimate there should have been about 40L in my tank. I managed to fill up my guys motors with about , I think, 20L max??
When it broken down I opened the fuel tank, but i dont remember looking in, coz i didnt want to flash a light so close to the open tank. so i dont know if it was bone dry then, or after the 2 weeks of sitting with the gas cap slightly cocked open. I was however clever enough to put the fuel pump cover back on justwith 2 screws so it wasnt completely open, jsut thte gas gcap was loose.

So in short, i dont know if it all evaporated after the pump broke and i opened the system,,,, or if it just ran out. but im about 60% convinced the pump broke, then the rest evaporated coz i left the cap open, then i put a pump back in and didnt seal its o-rings properly, then the car gets a new fuel pump and is being over fueled. (ROLLS EYES) now has oil problem, probably becasue the mechanical gods have no respect for me.

I undid the battery for hours, and i thought that would reset the ECU, but it doesnt, u have to do an idle relearn, which, involves getting the car hot enough to activate fans, which i cant, so now i conrtradict a previuoos post i made saying that the idle relearn procedure is pointless. its not pointless when your car cant idle and you cant drive the required cycles to make it re learn.
.
Ill be interested to see what the honda techs say, but im sure it will be aong the lines of , SIR ITS TOO HARD FOR US, YOUR CAR IS VEDY OLD SIR. Getting older sucks
 
#16 ·
se avisitor, im not even sure if it ran out of fuel.
THe night after the typhoon, we drove a logn distance and found an open gas station runing on genset! so i filled up cmpletely, 60 litres.
THen drove home about 70 km.

So i estimate there should have been about 40L in my tank. I managed to fill up my guys motors with about , I think, 20L max??
When it broken down I opened the fuel tank, but i dont remember looking in, coz i didnt want to flash a light so close to the open tank. so i dont know if it was bone dry then, or after the 2 weeks of sitting with the gas cap slightly cocked open. I was however clever enough to put the fuel pump cover back on justwith 2 screws so it wasnt completely open, jsut thte gas gcap was loose.

So in short, i dont know if it all evaporated after the pump broke and i opened the system,,,, or if it just ran out. but im about 60% convinced the pump broke, then the rest evaporated coz i left the cap open, then i put a pump back in and didnt seal its o-rings properly, then the car gets a new fuel pump and is being over fueled. (ROLLS EYES) now has oil problem, probably becasue the mechanical gods have no respect for me.

I undid the battery for hours, and i thought that would reset the ECU, but it doesnt, u have to do an idle relearn, which, involves getting the car hot enough to activate fans, which i cant, so now i conrtradict a previuoos post i made saying that the idle relearn procedure is pointless. its not pointless when your car cant idle and you cant drive the required cycles to make it re learn.
.
Ill be interested to see what the honda techs say, but im sure it will be aong the lines of , SIR ITS TOO HARD FOR US, YOUR CAR IS VEDY OLD SIR. Getting older sucks
se avisitor, im not even sure if it ran out of fuel.
THe night after the typhoon, we drove a logn distance and found an open gas station runing on genset! so i filled up cmpletely, 60 litres.
THen drove home about 70 km.

So i estimate there should have been about 40L in my tank. I managed to fill up my guys motors with about , I think, 20L max??
When it broken down I opened the fuel tank, but i dont remember looking in, coz i didnt want to flash a light so close to the open tank. so i dont know if it was bone dry then, or after the 2 weeks of sitting with the gas cap slightly cocked open. I was however clever enough to put the fuel pump cover back on justwith 2 screws so it wasnt completely open, jsut thte gas gcap was loose.

So in short, i dont know if it all evaporated after the pump broke and i opened the system,,,, or if it just ran out. but im about 60% convinced the pump broke, then the rest evaporated coz i left the cap open, then i put a pump back in and didnt seal its o-rings properly, then the car gets a new fuel pump and is being over fueled. (ROLLS EYES) now has oil problem, probably becasue the mechanical gods have no respect for me.

I undid the battery for hours, and i thought that would reset the ECU, but it doesnt, u have to do an idle relearn, which, involves getting the car hot enough to activate fans, which i cant, so now i conrtradict a previuoos post i made saying that the idle relearn procedure is pointless. its not pointless when your car cant idle and you cant drive the required cycles to make it re learn.
.
Ill be interested to see what the honda techs say, but im sure it will be aong the lines of , SIR ITS TOO HARD FOR US, YOUR CAR IS VEDY OLD SIR. Getting older sucks
I doubt the pressure is too high. The pumps are all about the same.
Check this filter which again is KZ only. Cost 260 baht inThailand and used on Accord and Civic.
It is located in the fuel line next to the evap box. If you cant get a replacement just back flush.

Image
 
#17 ·
There is a pressure relief valve on the fuel rail. Is it functioning? If so I doubt your fuel pressure is too high.

it’s possible you just didn’t notice the condition of the oil before, and now you’re looking at everything very closely.
 
Save
#18 ·
On this one, the thai made KZ model, the pressure relief valve is in the tank, on the pump filter sender housing, and the rail only has a pulsation damper.

Anyway,. update, honda rang and said YOU CANPICK UP YOUR CAR NOW SIR.........

I was confused, so i questioned them and they said, WE REPLCAED SPARK PLUGS ALL OK NOW SIR.

So somehow, putting in a new fuel pump has coincided with the failure of all 4 spark plugs. They swear black and blue they didnt do anything secretive, and the charge was a measly 2500 pesos, about 60 USD. this is the least money ive paid for any automtive maintenance or service in my life.lol.

They had the original fuel pump in their hands when I picked it up and said to me, i"ts ok sir the new cheap pump you bought is good, its just the spark plugs".
They started it, and now it idles and sounds and performs better than ever.

So is it possible that i was under-fueling it with bad fuel pressure all this time?, and at the same time the spark was so weak but that was assisted by a lean easy to ignite mixture??????
Thats sonds insane but nothing makes sense, the spark plugs in the condition they were, were perfectly fine until a new fuel pump was installed, so my only consensus is that, a proppely rich mixture is harder to ignite than a lean mixture, so maybe the new fuel pump brought everythign up to sepcification, which embphasised the fault of the failing sark plugs....

OR

Honda are lying and simply did some kind of ecu idle re-learn , and had to charge me for somethign so picked spark plugs as a scape goat....
They really did change the spark plugs, and i can see some evidence of browning on the white insulators...

It drives incredible now, so this whole thing is a bit of a blessing, in a realy really bad disguise.

I must just be getting old and crazy, and becoming generally bad at this kind of thing. In my teens and 20s, i was under the hood rebuilding engines and diagnosing things like a proffessor. MY mechanical life is over.
 
#19 ·
Don't sell yourself short.

I just had a similar issue on an older car and the 'fix' was new plug wires. :rolleyes: I was looking at timing and fuel delivery...
 
Save
Status
Not open for further replies.
You have insufficient privileges to reply here.