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Tractor towing vehicle problem

D

Doug - Iowa

Member
My 454 Vortec needed a new fuel pump (electronic, in tank) a couple months ago, put in a Delphi brand (GM) and seemed to run fine. Latched on to the trialer today to haul one and at 60mph if you get on it she just falls on her face. Always had plenty of power before. I thought those pumps were a work/don't work type failure, is it possible this one is simply not flowing enough at the high end? But flowing enough when not towing? Ideas?
 
Fuel filter clogged will do that as a pump going weak. That is one of the problems with the newer fuel systems and them needing 50 plus PSI for thing to work as they should. Pump do in fact get weak and then you have a problem with being ok for light duty but not enough for heavy duty work.
 
I think "old" is probably correct if you didn't change the fuel filter at the same time you changed the pump. If its bad (plugged)you may ruin this one also and I know from experience they aren't cheap and a bear to put in.
 
I did change the frame rail filter as well as that little sock on the pump inlet but I suppose you can pick up a bad tank of gas and plug those all up. The pump makes more noise new than the old one did before wearing out, I think I got a bad pump. It's under warrenty but of course I got to drop the tank and reinstall the new one.

This will be the 4th GM tank R&R this winter, two already for fuel pumps and one leaker. I'm getting pretty good at it.

Thanks for the help Old and Flurette Farm.
 
The elctrica connector on top of the tank could have burnt terminals. The ground wire terminals [black wires] will show the burnt spots. Install a new connector and connect both black wires to a good ground on the frame. ACDelco makes a connector with wires, therefore no need for a new harness. Fuel pressure for 1996 and newer is 55 to 60 psi.
 
I put a new pump, filters and sock in my 97 chevy and it would not start, but it ran before I replaced. Took it back and found out it was a pump that had not worked on another install, but they thought it might work. Wish they would have told me that before I went through the work of installing. But anyways, the reason I replaced it was it was running very loud and did not have any power on the higher end. Got the good new one in and it was like I had a new truck.
 
I have the same engine in my truck and lost the pump a couple of years ago. Put a Delphi in it and all is well. I agree with Old, change the filter and see what happens. If you have a way to check the fuel pressure while driving that will tell you if the fuel delivery is up to snuff.

Greg
 
i agree pull the box off. i have done 8 that way. 6-8 bolts and wiring harness for the taillighs. undo filler neck and ground cable attached to it and pick the box off and makes it very easy to work on.
 
Did they sell you the proper pump? They look the same on the outside but the volume and pressure vary.
Low voltage due to a high resistance +12V or (-)chassis return is also a suspect.
Putting a pressure gauge on the fuel rail beats guessing.
 
Start with the filter... but I wouldn't say it's impossible to have a bad pump. I went through three pumps in a bit over a year on my Ranger. The last two in mabey a month. The last time... they said there was sand in the tank. They finally cleaned it out properly that time. No trouble since. That was 2 years ago. Those were NAPA pumps...

Rod
 
if all that doesn't help check catalitic converter,..just went through the same thing,.fall on its face on hard pull,...new converter and she's fine
 
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