Dual fuel tank will not switch over


Asked by Jul 15, 2013 at 11:21 PM about the Chevrolet C/K 1500

Question type: Maintenance & Repair

I have an 85 Chevy pickup. It has
350 motor with dual fuel tanks. Both
tanks are full of fuel but when right
tank gets low on fuel & I try to switch
to the left tank which is full, truck
acts like its starving for fuel. Most of
the time I can't even start my truck
on that tank. I've had the truck for a
lil bit over a year & it just started
doing this like 2 wks ago. Please help
me figure out what is wrong with it.
Have a full tank of gas & can't use it!!

9 Answers

James Ramond

is their duel fuel pumps? one may be failing, two filters?one may be clogged. chevy truck forum will tell, Im not a mechanic of vehicles but take a few wild stabs in the dark. and really hit pay dirt it seems. Oh another thing the diverter valve may not be slamming the slammer causing restriction !

1 out of 1 people think this is helpful.

Thank you! I haven't really looked because wasn't sure where to start. At least now I can at least check into all that you described. Again much thanks!

is this a solenoid or manual diverter? if a solenoid would take a look at the fuse...mechanical diverters can be serviced too~

2 out of 2 people think this is helpful.
Best Answer

on cars that I have seen have a handle to flip the connection (pulling gas into the passenger compartment) probably that's why we keep this business out of your footwell these days~

1 out of 1 people think this is helpful.

It could be the dash switch, but most likely the switching valve under the truck. If you follow the fuel lines from each tank, the lines join together at a silver valve bolted to the frame. These can be purchased at O'reilly, Pep Boys, etc.

1 out of 1 people think this is helpful.

I have almost the same problem with my 85 truck. I can drive it a couple of days, then the next day it won't start. If I toggle the switch back and for then I can sometimes get it to start.

Marvin Thomas

Don't no


check for a clog in the sending unit in the left tank. even if the right tank is empty, that system is supposed to pull the fuel from the left tank automatically. when I bought my '86 c20 454ci with the dual tanks, the truck's gas gauges didn't work and I didn't know it, but the right tank was empty and the system was pulling from the left tank when the right tank was empty.

Patricia Juarez

I'm having same issue. It started with happening with one tank. Then two weeks later the other tank is not getting fuel now. Can't start it at all now.

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