Off topic auto question regarding 1996 GMC 1500

[justincorbell]

I just picked up a 96 GMC 1500 z71 and I'm having power issues. The truck is a 5speed standard with the 5.0 motor, it sat for 3years before I bought it. When I bought it it wouldn't run all due to a fuel pump 20amp fuse. I replaced the fuse and drove it home with no issue however over the past week it has started losing power. It does not die on me but I can put my foot to the floor in gear and the rpms will not rise and it will not pick up speed, I can throw it in neutral and the rpms rise with no issue. So far I've replaced the inline fuel filter the air filter and the entire exhaust including all 02 sensors. My best guess is that the fuel filter inside the tank connected to the fuel pump is clogged up so this weekend I plan to drop the tank, replace the fuel pump and clean out the tank but i wanted to see if anyone had any idea on the issue and what other possible areas I should look at. Afte

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[justincorbell]

After I replace the fuel pump I plan to look at the injectors if the issue isn't fixed. I'm also going to replace the plugs and wires just because.

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[Judge peel]

I got a 93 gmc that I just rebuilt. It was doing a similar thing when we broke it down it had spun a main and the crank had shifted forward and that was the loss of power under load. But it could be anything with those yr models


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[charles]

My 12’ cummins had a similar issue. I had refueled it from the 4 jerry cans i brought with me to oregon. It acted up, i took a sample out of my filter and it had a lil water. I put a water dispersant agent to mix the water with fuel. On my way hm, i got south of salt lake and fueled up bc i couldnt accelerate to highway speed and i had a 1/4 tank left. I spent 2hrs draining water out of my filter housing and cracking the inlet line to the pump. After getting hm, i dropped the tank and was able to separate 2 gal of water from the diesel. My pump also had a heavy slime build up 1/4 the way up the filter screen and the bottom was solid sludge.

In park or neutral, i could build rpms, but once i got to around 1/4 a tank, it said F you. My 16 and 18, i put a drain cock on it in case that ever happens again. I eventually traced it to the lack of a good seal on the jerry cans, displacing fuel for water. In oregon, it rains a LOT, so that was the only thing i could think of that caused that much water in the fuel.