In tank electric fuel pumps?? - Page 4

crabtruck · 10-26-2009, 05:00 PM

Actually what Finatic said COULD work,
only problem is you still have a problem.
That's a "get you home" type fix.

partsman · 10-26-2009, 08:09 PM

Okay, had a buddy from work drop by and look at truck, he used to work for GM dealer, anyway he took a look and tried some things, and at one point the truck fired up, but didn't again, he had no tools so just working with what I had which was not much as we both just got off work.
It appeared to be random thing, I did have the battery charger running as I had run the battery pretty low when trying to get it going before having it towed home, he did get to see the fuel pressure at 50psi while running.
Anyway when he left after a while I tried and it started, had 50 also when running, which had been zero before when trying to crank it, if you hit the throttle it moves a tiny bit up then seems to drop a wee bit then steady out.
Anyway had to take daughter to a class she is in so took car, but tried turning the truck over and the truck started, turned it off, came back a good half hour later and it fired and ran again, so am going to go out and try again when I go out to get daughter, will see what happens, the fellow from work is coming back tomorrow and bringing the wiring diagrams, but I will tell him I had it start at least three times now.
I wonder if the fact it runs at 50 Psi means it is not the pump but something else.

crabtruck · 10-26-2009, 08:24 PM

Still betting on #13 (ha, a lucky guess ?)

Kennyray · 10-26-2009, 08:43 PM

If my memory is right, I think you should have around 62# of pressure, I think you have a week pump

Chevy_Finatic79 · 10-27-2009, 08:06 AM

cranking/start pessure should be like 10% higher than when running at idle i will check mitchell1 when i get to work and post what the pressure should be in p.s.i.

partsman · 10-27-2009, 10:37 AM

Thanks, that would be nice, I gather I should only worry about the pressure at key on eng off, but I couldn't see the guage from the drivers seat and when the fellow did it he did not say what pressure he saw, he told me he did not get a feed to the relay, and thinks it could be a couple things, even the computer I think he said which would be expensive.

Crmzendrgone · 10-27-2009, 11:50 AM

Quote:

Originally Posted by hotrodpc

yeah, do what he said. It always worked with the kids raising them. One good whack they worked for about a week to 10 days, then had to whack'em again.

Ain't that the truth.

Crmzendrgone · 10-27-2009, 11:51 AM

Quote:

Originally Posted by crabtruck

Actually what Finatic said COULD work,
only problem is you still have a problem.
That's a "get you home" type fix.

This is true, I used this method to get my truck from the back lot of the dealership I worked at to my bay. Sputtering and kicking the whole way.

crabtruck · 10-27-2009, 12:09 PM

Quote:

Originally Posted by partsman

...the fellow did it ..., he told me he did not get a feed to the relay,
and thinks it could be a couple things, even the computer I think he said which would be expensive.

If he did not get that "feed" items #6 and #7 from my list would have started it right up.
If the "feed" referred to the signal from computer,
keep in mind that the relay is only about as complicated as a light switch.
If the "feed" referred to the hot,
a fused jumper from #30 in relay socket to batt would have started it.

The other thing that seems to be getting lost here is that it died while driving.
At that point the truck is not using the relay anyways

If you have not done so yet, you really need to check wires by tank.

Chevy_Finatic79 · 10-27-2009, 12:16 PM

mitchell1 says for the 4.3-5.0-5.7Liter engines the fuel pump P.s.I. should be 60-66p.s.i.
7.4Liter engine 56-63p.s.i.

10-26-2009, 08:43 PM	#34
Kennyray Senior Member Join Date: Oct 2005 Location: Birmingham, AL Posts: 648	If my memory is right, I think you should have around 62# of pressure, I think you have a week pump __________________ On a quiet night you can hear a Ford rust

10-27-2009, 08:06 AM	#35
Chevy_Finatic79 Senior Member Join Date: Mar 2008 Location: Lincoln NE Posts: 478	cranking/start pessure should be like 10% higher than when running at idle i will check mitchell1 when i get to work and post what the pressure should be in p.s.i. __________________ "She's gonna Freak when she see's my wheels" 85' Chevy C-10 Longbox (Rat) TBI 327 Cu.In./THM350 90' Chevy Suburban 4x4 TBI 350 Cu.In./700R4 http://www.truckforum.org/forums/truck-pictures-176.htm

10-27-2009, 12:16 PM	#40
Chevy_Finatic79 Senior Member Join Date: Mar 2008 Location: Lincoln NE Posts: 478	mitchell1 says for the 4.3-5.0-5.7Liter engines the fuel pump P.s.I. should be 60-66p.s.i. 7.4Liter engine 56-63p.s.i. __________________ "She's gonna Freak when she see's my wheels" 85' Chevy C-10 Longbox (Rat) TBI 327 Cu.In./THM350 90' Chevy Suburban 4x4 TBI 350 Cu.In./700R4 http://www.truckforum.org/forums/truck-pictures-176.htm Last edited by Chevy_Finatic79; 10-27-2009 at 12:31 PM.

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10-26-2009, 05:00 PM	#31
crabtruck Senior Member Join Date: Jul 2007 Location: on your 9 Posts: 3,366	Actually what Finatic said COULD work, only problem is you still have a problem. That's a "get you home" type fix.

10-26-2009, 08:09 PM	#32
partsman Senior Member Join Date: Jul 2008 Location: Poco BC Posts: 83	Okay, had a buddy from work drop by and look at truck, he used to work for GM dealer, anyway he took a look and tried some things, and at one point the truck fired up, but didn't again, he had no tools so just working with what I had which was not much as we both just got off work. It appeared to be random thing, I did have the battery charger running as I had run the battery pretty low when trying to get it going before having it towed home, he did get to see the fuel pressure at 50psi while running. Anyway when he left after a while I tried and it started, had 50 also when running, which had been zero before when trying to crank it, if you hit the throttle it moves a tiny bit up then seems to drop a wee bit then steady out. Anyway had to take daughter to a class she is in so took car, but tried turning the truck over and the truck started, turned it off, came back a good half hour later and it fired and ran again, so am going to go out and try again when I go out to get daughter, will see what happens, the fellow from work is coming back tomorrow and bringing the wiring diagrams, but I will tell him I had it start at least three times now. I wonder if the fact it runs at 50 Psi means it is not the pump but something else.

10-26-2009, 08:24 PM	#33
crabtruck Senior Member Join Date: Jul 2007 Location: on your 9 Posts: 3,366	Still betting on #13 (ha, a lucky guess ?)

10-27-2009, 10:37 AM	#36
partsman Senior Member Join Date: Jul 2008 Location: Poco BC Posts: 83	Thanks, that would be nice, I gather I should only worry about the pressure at key on eng off, but I couldn't see the guage from the drivers seat and when the fellow did it he did not say what pressure he saw, he told me he did not get a feed to the relay, and thinks it could be a couple things, even the computer I think he said which would be expensive.