I have used the 99-03 GM truck 1500/2500 fuel pump sending unit. These factory fuel pumps are very good at scavenging fuel from the tank to feed the pump. The pump sits in a “can” that has a one way check valve or a jet pump to fill the can, the return line also returns the can to keep it full. We recommend using an AC Delco or Delphi unit, there are many cheap pumps on the market, but the AC Delco has a unique jet pump feature that pumps fuel from the tank into the can to constantly supply the pump with fuel. You can identify the units with the jet pumps from the T at the top of the pump in the pressure line; the small hose from the T will go to the bottom of the can.
There are two options for the fuel pump sending unit, one without the EVAP, MU1614 (AC Delco#) and one with the EVAP emissions, MU1613. Either one will work, but you will likely not use the EVAP solenoid so no need for it, however the EVAP equipped unit is often less expensive and more common than the unit without the EVAP
The fuel pump sending unit should come with the gasket and wire pigtail. The two larger gauge wires are for the fuel pump, grey for the +12V, black is ground. The two smaller gauge wires are for the fuel level gauge float arm, if you are using an electric fuel level gauge, the fuel level sender unit output is 248 ohms full, 39 ohms empty
If you have a higher horsepower engine and need more fuel than the stock pump output, a high output sending unit from Walbro is available, or a drop in pump upgrade kit is also an option. Upgraded drop in kits are good to ~600hp.
There are 3 ports on the top of the sending unit, the largest of the 3 and label “F” is the pressure line that would go to the fuel filter and fuel rail of you engine. The feed line requires a 3/8 quick connect adapter to convert to a -6 AN fitting.
The port next to the feed line (middle port) is a vent line, it features a roll over valve so you can use it as a vent, it requires a 5/16 quick connect adapter to convert to -6 AN. If you use the roll over valve/vent on the fill plate, you can T this into that vent line or just cap it with a vacuum cap or similar
The third port is the return line, labeled “R”, this will be the fuel return from the engine or fuel pressure regulator, this also requires a 5/16 quick connect adapter to convert to -6 AN.
If you are running a returnless system, I would use a corvette filter/regulator. This will keep the proper pressure in the system, and is a commonly stocked part. If you go this route, you can mount the filter/reg close to the fuel cell, and have a short pressure and return line, then a single -6 line from the filter/reg to your fuel rail.
This isn't exactly what you are looking for, but this is how I plumbed my TJ tank with a drop in 255LPH walbro pump and the corvette filter/reg.
If you go this route, I have been advised not to use the imported filter/reg with the AN fittings brazed on. It has been reported that the quality is garbage and will cause reliability issues.
