corvette Stu

About three weeks ago after driving an hour turning it off would not start after sitting about ten minutes had to sit for an hour before starting drove fine. Put some dry gas in it now after sitting a couple of weeks it starts right up but dies in 2 seconds and will not start. new two years and 1500 miles fuel injectors and filter. I'm thinking fuel pump and screen ?

zr1fred

Don't start replacing parts. First get a fuel pressure gauge and make sure about the pressure. Second take the ignition module in and have it checked out. Failure AFTER running is usually ignition related.

THE 383 admiral

As above. you need to rule OUT the basics. Codes, Spark, fuel pressure. at prime & idle.
this does sound like a classic Weak FP. confirm. do NOT guess!!

corvette Stu

After spraying carb cleaner in the throttle body when it won't start and it runs for a second I've narrowed it down to fuel problem going to put a fuel pressure gauge on it can someone give me the numbers to look for ? Hopping it is the fuel pump.

nickyg

This exact problem started happening to me yesterday (94 coupe) for the first time. I'll let you know what I find out.

zr1fred

Appox 42psi regulated (at idle) 48psi open throttle or regulator disconnected. The car should run with anything over 30.

corvette Stu

So with the engine not starting and the key on it should be 42 then turn the key off and see if it drops and how fast ?

corvette Stu

OK thanks

nickyg

I just checked my fuel pressure with key on/ engine off. It was 35 psi. Left key on for about 10 minutes - went down to 25 psi. I'll check FPR when I can get it started again to see it it's functioning properly. When pulled vac hose, no smell and no leak from FPR. More to come. I'm glad my truck is my daily driver lol.

corvette Stu

I hear yea mine is a show car and not being able to take it is killing me and the season will be over before you know it

antfarmer2

Key it on a few times without cranking the pump should run for 2 seconds and hit 40+ . If not look at the pump, filter, sock and pulsater. I would change all.

Shoot some fluid in the intake if it fires you have your answer.

nickyg

Update: Got'r started and checked FPR and checks out Ok. A rise of approx. 10 PSI when hose pulled. Injector o-rings check out ok. Took of ICM and it and the plate it mounts to were almost dry as a bone. Took it to O'reilly's and they check it on their machine 3 times and it came up bad on all 3. Will get new one tommorrow. Hopefully will solve problem.

antfarmer2

Do not forget the thermal grease!!!!!

nickyg

Hell yeah. Never forget the special sauce haha.

nickyg

Update: Just changed the ICM (with special sauce haha), took it for test drive to get it nice & hot. Got home, turned it off, started right back up 4 times. I love it when diagnostics work out.

corvette Stu

I found out I need a new fuel pump. I picked one up but after some research on the placement of the screen I am totally confused on how it should be placed. could anyone show me the correct way it should go ?

nickyg

The screen should go in the same orientation as the yellow tray in the tank. Here's a link: Fast forward to about 12:26 or so.
How did you determine it was your fuel pump. I thought I solved the problem with a new ICM, but it's still happening. Would really love to know as I am stating to get a little crazy with this haha

corvette Stu

I saw that youtube and the girl at the end really confused me on the direction of the screen. I put a fuel pressure gauge on it turned the key and no reading so I checked for power to the pump and all was good that told me it was not a relay or fuse problem. When I pulled the old pump out the screen was perpendicular to the yellow tray in the tank.

corvette Stu

Put a new pump in and it runs great. Thanks for all the advice

nickyg

Awesome. Glad to hear.