New motor start up problems 1990 suburban 350

[dyeager535]

With the key on, what does the gauge read with the sender disconnected now? What does it do with the gauge wire (not the pump power!) Grounded under the same conditions? If the gauge doesn't max out both directions, the problem isnt (entirely) the sender.

You can connect the sender outside the tank and move the float to see if there is a dead spot, but you will probably be able to see on the metal wrapped contact area if there is a dead spot or lot of corrosion. You can try and clean it up if it's corroded.

If you don't need more fuel pressure, and know you won't in the future, then a stock replacement will be fine. Nothing wrong with the upgrade pump, but at this point if I was considering that I'd probably go with someone like Walbro.

Delco pump should come with the in-tank sock filter and hose, not sure about the aftermarket stuff.

 

[Blue85]

Yeah, replace the hose while you're in there. If the old hose was split, that was likely the problem and you could keep the old pump as a spare.

 

[K588]

Pulled the tank yesterday. That small section of hose between the pump and steel line had a 1/2" split in it. I replaced it and the pump while it was out with the ep381 ac delco pump from the parts store. I'm pretty sure that was all that was wrong.

Had to order the full replacement stainless fuel line set from inline tube when I replaced the fuel filter, fitting was seized up, so I'm going to take the opportunity to replace the lines coming off the tank while it's out.