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99 Chevy Truck 1500 5.3

2K views 6 replies 4 participants last post by  T-bucket23 
#1 ·
I have a weird issue and looking for some insight.
I have a 99 Chevy truck with a 5.3 with multi port injection. It is not the spider type it has a regular rail with injectors. Truck wont start. Has 60LBS of fuel pressure at the rail, specs call for 58-62. It almost starts but not quite. So I start poking around, pull the line off the fuel regulator and there is gas in it. Turn key on and fuel comes out of the vacuum port on the regulator. Ok so I think I found the issue. Replaced the regulator and the truck started and ran for a few seconds and died, start it again same thing. Back to no starting. If I spray fuel in the throttle body it starts and dies of course, so I know the spark is ok. I am getting pulses at the injectors. At first if I played with the gas pedal at about half throttle it would start and run really rough for 15-20 seconds and die.

Anyone seen this before. I have not done a lot on this particular setup but it seems somehow the fuel is not getting from the rail to the injectors.

Any Ideas would be appreciated.
 
#5 ·
Follow up
Fix it today, nothing made sense. Pulled the plugs they were wet so the injectors were spraying into the cylinders. Still started up if you spray into the throttle body.

So I used the tap on the fuel pressure gauge to check for volume, volume was great but it was all water :spank: .

Jumped the FP relay and drained the tank. There were 3 gallons in it and half of it was water.

Put in fresh gas and a few bottles of dry gas and it lives.
 
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