[Katrina/10]

Originally Posted by MARKDTN

Just a followup on pumps. I have never done a TBI retrofit that didn't use a stock GM tank in some way with an in-tank pump. I did some research so I would know what is out there. There is a lot of disagreement out there on a proper external pump. Looks like 3 options for a pump:
1-use a GM tank with internal pump like an early TBI Blazer tank. But if you want to keep the original in-cab tank this won't work.
2-low pressure external pump. Carter P5001, Master E8094, or Walbro GSL395 seem to come up a lot.
3-high pressure pump. There seems to be a lot of people that run the '88 Ford Truck style high pressure pump that I have used for several TPI conversions. This is an Airtec E2000. You would probably have to have a 3/8 return line for this option or I believe you will overpressure the regulator. It also seems to me that a lot of people using this pump have larger injectors in the throttle body and/or are using it at a higher pressure than stock-but some claim to use this with stock TBI.

I used the 8094 external pump on mine, gives the proper TBI fuel pressure and works fine. I also was able to install a TBI pump from an 87 R10 in the stock fuel tank, but I took it out because it was noisy.