i put a 1974 400 small block in my 1996 gmc and i am having troubles with it wanting to die because the fuel pump keeps wanting to shut off. how do i bypass this problem

Asked by Feb 03, 2017 at 09:37 AM about the 1996 GMC Sierra 1500

Question type: Car Customization

15 Answers


No its not that, the 1974 engine is not controlled by a computer. I don't thing this is going to work as the 1996 has an OBDII computer that runs the engine. And you cannot exchange the intake manifold for the fuel delivery system and all the sensors. The computer also controls the '96 trany. The '96 has a totally different electrical system. Your gauges are not going to work either.

none of that is a problem. the only thing left of that truck that is still a 96 is the fuel pump set up and the body, no computer problems i know what the problem is i just need help fixing it.


How about running an inline fuel pump? Or the mechanical one off the block? Or try wiring the fuel pump in the tank up like an inline fuel pump?

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do you know of a way to make the fuel pump stay on constant with the ignition?


Did you install fuel injection on this engine or does it have a carb. If it has a carb the fuel injection in tank pump will not work.


It would work Bob, worst come to worst, all you have to do is put a inline fuel regulator to adjust the fuel pressure down. Yea that fuel pump in the tank puts out like 60 lbs. So, I would tap in somewhere into the ignition power, so it shuts back off with the key. And then just run a ground on the other side.

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Best Answer Mark helpful

Looks like there are 3 wires to this which tells me the relay needs to be incorporated into the electrical system.


Yes with regulator it would work, but without one the needle and seat would not hold back 60 psi. Also curious if it needs a return line?


Yes it would need a return line, but they make regulators so that you would have one.

i already have a regulator, fuel pressure gauge and return line. just need to know how to keep the pump on consistently while the ignition is on. thank you


I'm heading to camp snowmobiling. So I am sure there are some wiring diagrams you can find on line. Use existing wire, splice and add too, you'll have to find a power line to tap into that is controlled by the ignition switch so the pump turns off with the key. Working off the fuse box would be best.


SNOWMOBILING? That activity requires snow and I hate snow. Be careful and have fun!

1 people found this helpful.

Don't eat the yellow snow.


Reminds me of the movie "Deliverance" LOL

1 people found this helpful.

I made it back, what a blast, rode a Ski-Doo Bombardier 800cc, unreal, before you knew it your were at 100 mph. Only did that at an abandoned airport out in never never land along the way on the trails. I was too scared to go any faster, only just over 1/2 throttle. We got like 10'' of snow while we were up there on Highway 13 close to Munessing. Well getting time to watch the Super Bowl.

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