78 looking to go TBI, but a question about fuel return

[Ben_Greenberg]

Hey guys,
I have been looking at TBI conversions for my 78 and the only part I'm worried about is fuel return.
I've got the 350 with a mechanical pump at the moment, and if I go with the TBI and an electric pump I need to run a return back to the tank. Will there already be a place for me to run something or am I going to need drop and drain the tank and drill a new opening for a new fitting, etc.? 

I'm looking at the setup offered by pfisys.com which is off a 1990 truck.

Any and all help is appreciated, also my truck is currently surrounded by several feet of snow, otherwise I'd be crawling around trying to get answers.

Thanks guys!

[Captkaos]

Looks like their setup runs an external pump.  Me personally I wouldn't run an external pump, I would run the one in a 1987 Sending unit.  But I would also call them and ask for what they recommend for their system.  The 87 EFI has a return port on it, so you could (if you had to) run a EFI rated hose from the TBI return back to it.  You could also purchase 87 Fuel lines.  But for starters I would ask them what would they recommend.

[Ben_Greenberg]

Captkaos,
Thanks a bunch! I will look into that!

[roundhouse]

To use the 87 in tank pump you have to use a 87 tank

You probably need a new tank anyway

If yours is original it's dented and has a lot of dirt in it


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[Captkaos]

You don't have to use an 1987 tank for the 87 sending unit..  Just don't run it really low.

[Ben_Greenberg]

Was there another part to that sentence?

[Captkaos]

No.

[roundhouse]

We have a frame mounted pump
Works fine as long as you don't run it dry

Then you have to prime it with a hand held vacuum pump or fill the tank  almost full


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