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Truck not starting.. fuel pump problem?

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Old 07-14-2010, 10:13 PM   #1
5.7L Vortec V8
 
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Truck not starting.. fuel pump problem?

Ok a little background

Did a Fuel injected V8 swap a couple of years ago and the truck has sat. Gremlins took over and now the truck wouldn't start. It had a v6 cpi motor.


I troubleshot the problem down to the fuel pump. Power was going to the wires but the pump wasn't turning on. Bought a fuel pump through it in.. you can hear it start but the truck won't start. Tried a different fuel pump in the garage.. same problem.

Truck turns over. If you spray starting fluid in the throttle body it will run for a few seconds off that.

Where should I be checking? This truck was running...
Old 07-14-2010, 10:28 PM   #2
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Re: Truck not starting.. fuel pump problem?

What kind of injection on the V8?
Old 07-15-2010, 07:42 AM   #3
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Re: Truck not starting.. fuel pump problem?

It's been a while I forgot exactly what it's called. It's a 5.7L vortec motor from a 97-98ish fullsize truck.. The v6 fuel pump had been working with the v8. I also tried another fuel pump that was in the garage intended for a tpi motor.
Old 07-15-2010, 08:20 AM   #4
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Re: Truck not starting.. fuel pump problem?

I'd check fuel pressure for starters 60-65 psi is normal for that Vortec 5.7
Old 07-15-2010, 11:24 AM   #5
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Re: Truck not starting.. fuel pump problem?

Quote: Originally Posted by how_low
Ok a little background

Did a Fuel injected V8 swap a couple of years ago and the truck has sat. Gremlins took over and now the truck wouldn't start. It had a v6 cpi motor.


I troubleshot the problem down to the fuel pump. Power was going to the wires but the pump wasn't turning on. Bought a fuel pump through it in.. you can hear it start but the truck won't start. Tried a different fuel pump in the garage.. same problem.

Truck turns over. If you spray starting fluid in the throttle body it will run for a few seconds off that.

Where should I be checking? This truck was running...



I replaced the fuel pump on my old truck amd it did the same thing I couldn't get it to start until I relized when I took the bed off I forgot to screw the ground wire back in when I put the bed back on so make sure you have your ground wire on
Old 07-22-2010, 05:40 PM   #6
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Re: Truck not starting.. fuel pump problem?

The pump runs so I don't think it's a ground issue.

Changed the fuel filter with no luck.

Going to run and get a fuel pressure gauge tonight.. not sure what that will show?
Old 07-27-2010, 12:49 AM   #7
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Re: Truck not starting.. fuel pump problem?

Poor ground will cause the pump to not pump enough pressure, will run like krap.
Old 07-27-2010, 02:51 AM   #8
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Re: Truck not starting.. fuel pump problem?

Did it ever run after the swap? The pressure should be about 50-55 at idle. If there is no pressure, there is gas in the tank and the pump is for sure working, something is clogging the lines or something.

Its kinda dangerous but unscrew the fuel filter, then hit the key for just a second to see if fuel comes out.
Old 07-27-2010, 10:33 AM   #9
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Re: Truck not starting.. fuel pump problem?

How old is the gas?
Old 07-27-2010, 05:41 PM   #10
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Re: Truck not starting.. fuel pump problem?

Ok so the result of the pressure test was roughly 5-8 psi.. nothing.

Truck ran after the swap .. problem was after it sat for a year or so not sure exactly.

We dumped the gas out of the tank and added new gas.

I do not have a manual.. does anyone know if this motor has a fuel pressure regulator? And where it would be located...

Bad ground? I could check that again..
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Truck not starting.. fuel pump problem?-p8030037.jpg   Truck not starting.. fuel pump problem?-p8030038.jpg  
Old 07-27-2010, 08:11 PM   #11
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Re: Truck not starting.. fuel pump problem?

Pretty sure I have an assembly that doesn't reach far enough in to the tank.. that'll be an easy fix. That would also make the most sense.. the pump was dead.. now it's not so it should work haha. When I dumped out all the old gas I only put in what should've been enough. I may have always had a few inches extra in the bottom of the tank. I'll check that later this week.

Thanks for the help so far.
Old 07-28-2010, 12:07 AM   #12
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Re: Truck not starting.. fuel pump problem?

FPR is inside the intake on the back side of the spider assembly.
Old 07-29-2010, 12:39 PM   #13
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Re: Truck not starting.. fuel pump problem?

No idea what the hell is wrong. The pump is submerged in gas

THE FPR is in that location on the V8 motor? I think I need to track down a diagram of this motor.


Strange thing is if you pop the pressure line off at the tank fuel is not spraying there so you'd think the problem was at the fuel tank end.
Old 07-30-2010, 12:58 PM   #14
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Re: Truck not starting.. fuel pump problem?

Yup, and sounds like fuel pump issue, might check for 12v at the pump... Also beat on the bottom of the tank lightly and see if it will start working?
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