ok so i bought a 91 crx, replaced the fuel pump, fuel tank, cleaned everything and wired it all up. when i tried to crank the car, it had NO fuel psi. i traced it back to the wiring to the fuel pump. i rewired it all, cranked it, it got 40 psi, then slowly fell back to 20, 18, 16, then about 6 psi. then my battery died. i tried a good battery this morning and now i have no psi again...sound like i need to rewire it all over again? im really getting tired of dropping this tank. haha but thats the only thing i can think it is. by some chance i have a connection that doesnt want to stay tight. anyone have any other ideas?

 

anyone?

 

Bumpy McBumperson! im almost tempted to sell her now.

 

Sounds like there is a hole in the system

 

ive been through it four times and i cant seem to find a hole anywhere. where would there have to be a hole at that it would cause no fuel pressure? i mean you could drill a hole almost anywhere in the system and it would still run. so it would have to be some magic hole right? everything seems correct to me atleast...

 

Main Relay?

 

nope thats good. ive tried four diff. ones. three of which i know worked. they all do the same thing.

 

cloggd injectors?

 

might be a short inside the connector at the pump.
or a ground issue.just throwing a few suggestions out there.

 

i thought about the injectors so i pulled the plugs and im getting fuel in the cylenders. so i ruled that out.
and as for the short somewhere. thats my thought. as soon as i rewired it the last time, fuel pressure went to 40psi. then fell. so it sounds to me like i have a wiring issue somewhere. but i cant, for the love of all things pink, figure out where it is.

 

time to rule out your pride and take it to a mechanic

 

If it was a short circuit then he would've blown a fuse somewhere along the road because amperage would have gone up. So that is implausible. Do a voltage drop test between the ecu pin for the fuel pump and the power wire running to the pump. If you get more that .2 volts with all of the accessories off then you have excessive resistance in your electrical wiring, thus creating an electrical impendance which could possibly cause the issue you are having. Don't do a continuity test b/c that is just bullsh*t. That test will not and cannot possibly tell you if you have a poor connection or wiring. I do believe that this system is a ground operated switch for pulse duration, so make sure your ground wire is properly operational. I'll look at some diagrams tomorrow to tell you whether or not it is ground switched or power switched. good luck.

 

UGH! NOOOOOOOOOO! lol i will never! i can figure this out. out of all the hondas ive worked on ive finaly met my match. she will not win! HAHA

and thanks. looks like i need to drop the tank a fifth time and check it all over again. its just wierd how it shot to 40psi then dropped over an hour or so. like i fixxed it then it f*cked up on its own again. huh...

 

so anyone else have any ideas before i drop this tank tomorow?

 

so i dropped the tank and replaced the whole fuel pump bracket thing with a different one, made sure all the wiring is correct and fine. and its still doing the same thing. im REALLY getting tired of this. ive checked everything i know and its all right. i cant figure this out. anyone know anthing about this? what would cause a pump to turn on but not pump fuel? noones ever had this issue?! im alone?!

 

Are the lines getting pinched on re installation of the tank? (just looked at that stuff today)
What about your fuel filter?
If it "works and then doesn't", it sounds like a loose wire to me...
good luck......

 

well ive looked and no hoses are pinched. ive also checked all the wiring and it all seems fine. fuel filter is brand new.
right after i redid everything tuesday i ran the power and ground for the pump straight to a battery and i got fuel pressure but only like 15psi and that was after priming the system like 856294 times. now im back a zero and its not doing anything again.

 

What about the fuel pressure regulator? OEM or aftermarket?
Did you check the sock filter inside the tank, sometimes they fall off.....
Also, the new fuel pump could be bad...
good luck

 

fuel pressure reg. is OEM off my DA that runs.
sock filter has not fallen off.
and ive tried three brand new pumps now and they all do the same thing.
i have to be overlooking something so stupid. if its something simple, i might go into to a pet store, find the cutest, most adorable puppy there, and kick it! i think i might be that angry. seriously, im ready to sell it almost. D:< <--MY F**K IT FACE!

 

BY THE WAY GUYS! the time i rewired the pump and it worked and went to 40psi. i had the car in the air and the tank hanging down. (pump side on the ground, sender side still up in the air) if that makes a difference. is it wierd that it worked when the tank was like this? i only have about 4 gallons in the tank. and id assume when i had the tank in this configuration, all the fuel was on the pump side. (like driving up a steep hill). i dont know if this helps just throwing it in for you.

 

oh yea! also the tank i bought is 2 gallons larger than oem. if that means anything...

 

this is the pump i bought. the strainer looks a touch different than the stock one. is that going to make a difference?
http://cgi.ebay.com/ebaymotors/NEW-F...Q5fAccessories

 

i was reading somewhere that aftermarket fuel pumps need a little bit more voltage. somthing like replacing the #14 10a fuse with a 15a....if its just the pump not working....but beats me

 

so ive read that if the sock filter is even a touch different it will cause problems around the 1/2 empty tank mark. i guess ill try a new sock.

 

The stock fuel filter socks from Honda have a little plastic tube that is a little longer and sits a little lower in the tank than the aftermarket ones. Bigger tank? How did you do that? Is it from a different model car? A bigger tank might mean that your fuel pump is now sitting higher in the tank. You may need the fuel pump bracket that goes with the new tank (longer?) to make the fuel pump sit lower in the tank.
I am currently in the process of lengthening the fuel pump bracket so that the pump sits lower in the tank.
In troubleshooting, 3 new parts(fuel pumps) in a row cannot be bad....Were the pumps new?
It still sounds like an intermittent wire problem. Check inside the looms for scraping, chafing, or other physical damage to the wires.
If your absolutely sure the main relay is good, it might be a bad key switch.....
Good Luck. Keep trying. You have to outsmart the car.