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1980 - 1986 Bullnose F100, F150 & Larger F-Series Trucks Discuss the Early Eighties Bullnose Ford Truck

single gas tank to dual?

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Old 04-12-2014, 03:49 AM
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Originally Posted by 81-F-150-Explorer View Post
The tank, the sending unit, the fuel selector valve, and basicly the whole system is different on your truck compared to his.

A: You have a six port selector valve, he would only have a three port with no return lines.

B: No in-tank fuel pumps, his is mechanical on the engine.

C: The tank opening where you put the sending unit in your tank is larger than his because yours takes a sending unit with in-tank pumps, and his is just a regular old fashioned sending unit.

D: Even your fuel selector switch in the dash is different than what he would need.

The only thing he could use from your truck is the filler neck.
I have a similar situation - 1980 19Gal side tank w. mech pump - My interior/dash is completely taken apart right now. I have a new pickup bed (dual tank) & want to add the rear tank. I have a 1985 (dual tank) donor truck. This is what I'm working with:

I want to replace my stock 1980 interior heating/cooling module thing with the stock module from the 1985 (b/c the 1985 includes the fuel tank switch) -

Will the easiest thing be to:
A) trace and pull all of the wiring attached to the 1985 fuel switch module so that I can use it in the 1980...(From memory, the '85 the fuel tank switch had maybe 10 wires running into it.. I don't yet know where all these wires run!)
B) get an electric fuel pump to update the 1980 side tank
C) Do I have to replace the 1980 circuit board on the back of the gauge cluster with the one from the 1985 donor?
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Old 04-12-2014, 03:49 AM

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