Fuel Pump & Rear Gas Tank Swap

I'm in the process of more or less replicating the Boyink swap. Being a non-gearhead and an engineer (extremely dangerous combination for an old Jeep owner), I've begun to wonder: What about the fuel pump?

I've used a 1978-86 CJ 15 gal tank. I'm unsure if, in the original application, it is designed to carry an in-tank fuel pump. But, I want an external pump for maintenance access. Given that the pump will have to pull fuel up from the lower, interior fuel level, and "over" the elevation of the upper surface of the tank (rather than the all "downhill" run of the fuel from the original under-seat tank), will the stock fuel pump do it? BTW, I have the original vacuum wiper that I would like to keep - driven from the stock fuel pump.

If not, what do I need to look for in the parameters of a replacement, presumably electric, fuel pump?

Appreciate any help.

 

No in-tank pump used in that era. The in-tank pumps go with EFI.

I suggest a mechanical pump on the engine if you are running a carburetor. Works fine, simple, very reliable. The distance to the tank won't matter.

If you can't be convinced to stay with a mechanical pump, a generic low-pressure (!) electric pump (Holley, Carter, whatever), as near to the fuel tank as possible, will be fine.

 

Thanks, Tim. The use of the original pump is great for me. It's the stock F-134. Just wasn't sure the pump would work with the new tank.

 

You have some valid concerns about the fuel pump for your rear tank.

It is always better to push fuel, than to pull it. Get enough suction on gasoline, and it will vaporize regardless of the temp.

In my case, I am going with a FI engine, so a fuel pump that makes 50 or so PSI at the engine is a must.

For your setup, you could just probably get by with a stock pump, and if that wont work, put in a Facet cube back by the tank, and keep the stock unit in place.

If you get carb flooding with two pumps, you have a bad float, needle/seat, or will need a pressure regulator, after the factory pump.

I suspect the factory pump will not like running without the fuel hooked up to it--------just so you can have vacuum for the wipers, so going to an electric pump only may not be a good thing.

But, this is best guess stuff-----hopefully others with actual knowledge gained by doing it will jump in.

Good luck.

 

Think I'll try it with the stock pump and see what happens. If it needs a boost, then we can move onward. Thanks for the tip on Facet, Mike.