Questions about the Fuel Pump

[mrnapolean1]

I am having to replace the fuel pump/sending unit/gas tank (due to varnish) and I have some questions. The truck is question is a 1991 Chevy silverado C1500 regular cab.

1. Does the fuel pump electrical current measure in Volts or ohms?

2. Gas Gauge doesn't work It shows full all the time. I was told by the previous owner that the gas gauge doesn't work for him either.
Would a cluster swap fix this? Or is it possible to do just a gauge swap?

3. How to tell what the fuel tank capacity is?

4. Will the larger 34 gallon tank from an extended cab pickup fit this truck? I think its (the 91) got the smaller 25 gallon tank.

 

[wally]

My 91 gmc reg cab long bed has a 34 gallon tank in it. I would assume that the excab model tank wiould work

 

[mrnapolean1]

My 91 gmc reg cab long bed has a 34 gallon tank in it. I would assume that the excab model tank wiould work

Mine is a short bed.
That tank is good on that truck.

 

[Keepinitoldskool]

With the moon gauges you can swap just the fuel gauge. Quick and easy to do.

 

[mrnapolean1]

With the moon gauges you can swap just the fuel gauge. Quick and easy to do.

Thats good to know. Mine have the moonie gauges.

 

[someotherguy]

The larger tank is from a longbed and will not fit a shortbed.

Richard

 

[CodeRed26]

like Richard said 34 gallon wont fit, fuel gauge problem is probably the sending unit but could be faulty gauge or even wiring seen all be the problem but the sending unit is the biggest culprit

 

[mrnapolean1]

The previous owner put a new sending unit in there. Same problem.

Moonie gauge shows dead full all the time.

 

[Keepinitoldskool]

Mine was doing the same and it turned out to be a faulty gauge.

 

[CodeRed26]

grandfathers truck was same thing ended up being eroded wires shorting together also just so you know sending unit can come fualty when you buy them got one from napa says full all the time ill get around to changing it out someday haha only been like that for over a year gotta change the box here soon so ill do it then