1991 305 auto
can i use the walbro 255 in my car before i swap? thats the pump i want to use when i swap my ls1 but my stock pump just went out and i dont want to replace it twice I figured if i have to replace it i want to do the ls1 pump needed as long as i wont damage the 255 lph pump runnning it on the 305 while i finish gathering swap parts

 

Sure can. I ran my Walbro GSS340 pump for two years w/ TPI before the LS1 swap, the pump has no problem delivering 48psi TPI pressure and is a good upgrade over the Delphi plastic turbine POS.

 

that part number you gave me is a ford mustang part number?!?!?!?!?!

 

GSS340 is a high pressure 255 ltr/hr pump. I bought it in a kit from Auto Performance Engineering (part# FPG-003 at the time) and it dropped right onto the TPI in-tank assembly.

I liked this pump at the time (long before LS1 swap thoughts) because it flowed more volume and drew lower amperage than the Walbro GSS307 standard 255 L/hr pump. That's goodness.

When I later upgraded to the LS1 engine, the pump was good to go. I've starved it running low on fuel several times on road courses, hasn't died yet. (knocks on wood big time)

 

I ran that gss340 also with my ls1, car starts up and runs with no problems. Although I still haven't been able to drive it on the road yet. Just upgrade that old pump and should be good to go.