si90rex

my car will start and run fine. but once i cycle the key the fuel pressure gauge drops down to 0 as soon as the pump stops. i dont have any fuel leaks, could the valve on the fuel pump be screwed up allowing fuel back into the tank? 255 walbron, stock injectors, aem fpr, stainless steal hose.

b1u3_5i

Check your Aem fpr. Adjust it to the proper fuel pressure for your application. You're loosing pressure prematurely.

si90rex

it holds a solid 44 psi once its running.

RICKSAUTOMOTIVE

dumb question, but is there an issue with the fuel pump relay? have you checked?

si90rex

desolded and resolded. lil over 2months ago.

RICKSAUTOMOTIVE

is it possible your soder job fell apart? i would double check it

honda_luvr_2000

If I understand correct, you lose fuel pressure when turn the car off right? But otherwise no running, or fuel shortage problems? It sounds like the fuel pump reverse flow check ball isn't working.
Here's a quick test to rule out the fuel pressure regulator:
If you still have the factory rubber fuel return line running off the fuel pressure regulator to the hard line, pinch it shut carefully with some vise grips right as you have a buddy shut the engine off. If fuel pressure still drops, it's the fuel pump check ball. If it doesn't drop it's the fuel pressure regulator.
Since you say it holds steady pressure while running, then I am willing to bet that it's not the fuel pressure regulator.
Another possibility would be injectors staying open, but that would cause starting problems because the cylinders would be flooded.

si90rex

I'll give it a shot. i have had the cel 43 fuel system come on rarely. but like i said no bogging, cutting out or any kind.

its not the main relay becuz the pump comes on everytime.

si90rex

apr is good. the check valve is bad. after pinching the hose, it held pressure until i let go. then it dropped to 0.
thanks for you help...

90zc_sirex

i got a 90 crx si zc swapped, and i dont know if im having the same problem as you or not, its very hard to get it started, it ran fine up until recently when it started getting hard to start then just stopped starting altogether, the starter is good, and its getting fuel and fire, i got it to start a few days ago, but it would only run for a few minutes then shut off.. any suggestions?

si90rex

i dont think the problem is the same since its shuts off after a few minutes. i would make sure you have good fuel pressure and spark plugs and vaccum lines are correct and not leaking. was it smoking when it ran? also check timing belt a tooth off would cuz some problems. if you got fuel and spark...all you need is air... and a working ecu to make a car run.

90zc_sirex

i got it started two times a few days ago and it would smoke for about half a minute then run for another five or six and shut off, i know its gettin air cuz you can hear it sucking in through my short ram when given throttle, how would i go abouts checking the fuel pressure? im pretty sure its getting good pressure cuz when i loosen the banjo bolt on my fuel filter the gas squirts out, new plugs and wires.. im somewhat limited on tools to the basic wrench set and the odds and ends needed to work on a car, but i dont have any electrical tools or anything to check my timing.

si90rex

timing can be check without a timing light. The cams and crank have marks on them that line up with marks on the block and head. i would buy fuel pressure gauge, do a compression tester.

steve_8475

bump good luck

90zc_sirex

im running a zc dohc, and all the marks on the cams crank block etc. make no sense, and it would appear as though the front cam and the rear cam are one tooth off according to the little arrow that says up..

si90rex

with dohc's the marks might be off a half a tooth just because the timing belt tension pulls one back a lil. so ur probably safe....is the head gasket broke? its odd when it dies does it fall flat or cough and choke out?