In tank fuel pump question

I would stay with a Name Brand pump. Since your unit is a GM, a Delco probably would be best. I have had some problems with after market pumps, mainly Airteck.
Recently I got a Delco pump form Rock Auto on line for about $100 less them local supplier.

Yes change the fuel pump, but it requires the tank to be dropped as it is on the top. Check the tank for rust also. The pumps have plastic components that don't last forever, and the pump itself is cooled by the gas, so don't run it standing still with less than a half tank. There is a video showing the entire procedure on line that will help you, showing all the connections. Make sure you use high pressure fuel injection line as it last longer, even if you have non fuel injected engine. Then there is a fuel injection rail regulator that probably needs replacing too.

trop-a-cal: He says he has a carburetor, not fuel injection.
OP: Do you have a carburetor with a mechanical fuel pump on the engine block or a TBI (throttle body injection in same location as a carburetor would be) with an electric, in tank, fuel pump?

I do have a mechanical fuel pump on the block. Still have a Qjet carb. I believe it's in the tank. with all of the years of crawling around underneath, I've never seen a pump external of the tank.

If you have a fuel pump on the block, then you may not have one in the tank. Since you have a Q-jet carb, and no injectors, all you need is the block pump.

double posted

It's possible this MH started out with a TBI system and was converted to a carburetor. I had a '91 454 P30 that was TBI and I had an '88 Suburban that was also TBI. If it started out as a TBI then he could very well still have the electric fuel pump in the gas tank. The mechanical fuel pump is then acting somewhat as a pressure regulator.

My old 1986 P30 had an external pump mounted a few feet away from the tank and it also had a Quadjet. I doubt it is in the tank itself. If you do drop the tank be sure to change all the filler lines also.
Steve, the manual pump is not strong enough to pull gas from the tank due to distance..

I know it has electric fuel pump because I have a switch on the oil pump line that feeds it. I had the switch fail some years back ( a long story ) so I limped home on the mechanical one alone. It traveled fine till you hit a hill or had to step on it to pass then it would pop and backfire. Once the switch assy was fixed all of the issues stopped.