1998 GMC 1500 is natorius for the in-tank fuel pump going bad. The pump it has is the kind that has the entire module that needs to be replaced every time for $250 (includes the fuel gauge sending unit etc). It's going bad again. Would it be possible and practical to install an in-line fuel lift type pump and control it via the same wires on the OEM pump. I'd like to cut the OEM pump wires at the top of the tank and use them to run the lift pump and keep the OEM fuel gauge wires intact on the existing pump so the gas gauge will still work.

Can it be done? Any ideas on what pump to use and where to get it?

Thanks!

Rob

A starting point might be Summit Racing (http://www.summitracing.com/). Call them at:1-800-230-3030. Or, Jegs Auto parts (http://www.jegs.com/) 1-800-345-4545.
Just besure the output pressure/volume is the same as the stock pump. Holley makes a nice inline fuel pump that might fit your needs.
You might have to fool around with the pickup to get good fuel flow.

doubt it, you need at LEAST 54 psi for the poppet injectors to work. Check connector at pump and make sure it has good contact. Sometimes the terminals get warm and burn or warp connector and cause problems. BTW, how often do you change filter, even partially clogged filter raises current to run pump causing brushes inside pump to fail quicker than normal. Don't know where you get pumps but NAPA has the connector kit if yours are bad

A lot of the old style pumps were made for the old low pressure 4 barrel carbs. The new generation of fuel pump is made for the fuel injected motor. Just looking over a catalog I found this one from MSD. Model msd-2225.

Free Flow Rate: 43 gph
Maximum Pressure (psi): 80
Inlet Size: 3/8 in.
Inlet Quantity: Single
Inlet Attachment: Hose barb
Outlet Size: 5/16 in.
Outlet Quantity: Single
Outlet Attachment: Hose barb


Multi-port EFI systems require a stable fuel supply to maintain the best performance throughout the engine's rpm range. These high-pressure and high-flow fuel pumps feature a roller vane pump mechanism, which is extremely resistant to clogging and jamming. The pumps mount in-line (out of the tank) with two supplied cushioned clamps for a quick and sturdy installation. The nipple inlet is 3/8 in. with a 5/16 in. outlet. The wire terminals feature brass studs for secure connections. Made in the U.S.A., the pumps are ideal as "boosters" for nitrous oxide applications, or as stand-alone pumps for multi-port EFI systems on engines up to approximately 500 HP.

Sounds like it might work.

Thanks!

A best route to go is a walbro 340 in-tank mounted pump, this is the same pump i use on my 2001 Trans-Am and it is supporting 600 rwhp.