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Old 12-26-2018, 01:15 PM   #39
AustinBelair
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Join Date: Apr 2005
Location: Austin, Texas
Posts: 291
Re: 1973-1991 Dual fuel tank systems theory of operation

You guys are super smart when it comes to this. I've got my 87 dual tank TBI that has the 4.3L V6 and I put all new parts in it and I cannot get the drivers side tank to fire. The pump primes with the key on and it will crank but I'm not getting fuel in the throttle body. I've checked grounds etc. All new stuff.

New tanks
New pumps/sending unit assemblies etc
New selector valve
New dash tank selector switch
New fuel filter


The passenger side works perfectly. I can key it on the DR side and I hear it prime but will not fire when cranking. Every now and then, it seems like it wants to start but it just cranks. I did find that the previous owner installed a "Kill switch" toggle switch mounted to the dr side kick panel. They basically cut one wire behind the dash selector switch and routed to the toggle then out of the toggle and back to the cut wire on the body side.

I removed the toggle and it still won't fire but works perfect on the pass side.

I'm lost.
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