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Old 03-07-2020, 10:20 AM   #78
Hart_Rod
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Join Date: Apr 2005
Location: Pensacola, FL
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Re: 1973-1991 Dual fuel tank systems theory of operation

Quote:
Originally Posted by hatzie View Post
That's the NL2 option wiring for the 87-91 TBI trucks.

There's a two position Weatherpak with the wire from the B terminal of the six position Weatherpak on the valve. This plugs into the standard wiring harness. That's where I'd start looking for Mickey Mouse wiring.

This all assumes that pouring five gallons in the LH tank will raise the needle on the gauge past 1/4 tank.
Does it do that?
LH tank showed 3/8s of a tank and I put approx 13 gals and the gauge went to full.
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