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Replaced fuel pump 3 times, now dies when giving gas or under load.

kaczman

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kaczman Enthusiast

kaczman

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Posted

2007 Avalanche 1500 5.3L Vin 3 LC9 Flex Fuel Truck.

I was having a large evap leak and the fuel level was reading off with less than 1/4 take full of gas. I decided to replace the fuel pump.

Dropped tank, replaced fuel pump with one from autozone. Fired it up, and problems. When you start it up and idle, it is fine. As soon as you give it gas, it dies, and then backfires through the intake. Tested fuel pressure at the rail, it has 50 psi at idle and then drops to 8 psi under load.

Assumed it was a bad fuel pump. Got another new unit from autozone. Same exact thing. Contacted local GM dealership, ordered a new pump off the Vin, a GM unit. Installed it, same problem.

If you give it gas and the engine dies, the stabilitrack light comes on, but scanning with a Tech2 there are NO CODES.

We are 100% stumped.

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