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Username Post: 86 fuel transfer issues        (Topic#358290)
J w judge 
Posts: 3

Reg: 10-02-19
10-02-19 12:06 PM - Post#2776924    

Complex issue.
Renovating an 86
Had a modified vortec engine installed.
Got around 400hp. Wanted to keep the dual
Tanks. Guy couldn’t figure out the transfer
Switch. There are four wires to it
Can any one tell me where they Should come from?
Diagram would really help.
They tried to operate the dual electric pumps
Through that switch but it’s all bonkers. Neither pump
Will work unless you fully depress the switch on the tank.
It will then crank but
You have to hold
It down for the motor to run.
I can figure out how the original
Wires were thinking of a three position
Toggle switch to run the pumps.
These guys did a great job on the motor
But I drove it home cut it off and then all the above
Issues started. Might add too there’s a lot of heat in that switch. Thanks in advance.

Mad Professor 
Posts: 106

Reg: 12-30-08
10-02-19 10:11 PM - Post#2776960    
    In response to J w judge

I have a wiring diagram but can't attach files?

How do you "enable attachments?

from what I see

pnk/wht to left tank, fuel level

pnk/blk to right tank, fuel level

pnk to bulkhead connector then inst panel

lt grn to fuel tank selector switch

dk grn to fuel tank selector switch

the greens via a connector and through a grommet, they run together.

62 Willys wagon
67 CJ5 Buick V6 w/OD
68 Camaro RS/SS , 69 LT1 350, M22
73 C10 292 6, M21 muncie/hurst, 3:73 posi
89 S10 baja package

Edited by Mad Professor on 10-02-19 10:31 PM. Reason for edit: No reason given.

J w judge 
Posts: 3

Reg: 10-02-19
10-03-19 11:15 AM - Post#2777001    
    In response to Mad Professor

If smart phone might screen shoot it. Depends
On your circumstances. Dropped by Chevy
Dealer today. Printed off six sheets of wiring
Diagrams. Everything except what I need.
Unfortunate today test a lot of people in businesses
Are inept to help.
Then yo Lowes got help. Forget that. If you can’t
Find it yourself don’t go.

Frequent Contributor
Posts: 1438
Age: 60
Loc: Murphy N.C.
Reg: 01-25-14
10-03-19 04:22 PM - Post#2777030    
    In response to J w judge

J w judge 
Posts: 3

Reg: 10-02-19
10-04-19 03:35 AM - Post#2777047    
    In response to J w judge

Many thanks. You did good for me.
I can now get it back to the original wiring
Going to put the in-tank pumps in a
Nice Toggle right under the transfer

Senior Chevytalk Moderator
Posts: 24977
Loc: Austin, TX 78748
Reg: 05-09-00
10-05-19 05:16 AM - Post#2777117    
    In response to J w judge

Welcome to the site. Go here to download a full factory manual.

To run fuel pumps off the switch, use relays to activate power. Running switch power to the pumps is not ideal. Are you using fuel injection or carb?

I’m about to go through a similar mess. The left tank on mine reads way paste full. Never know when the tank goes empty until the engine starts to shutter. A quick switch flip and it comes back to life. I’m going replace both sending units by lifting the bed.

'83 Silverardo XST - ZZ4 powered
'95 Jimmy SLT (Bought @131,814)
'96 GMC Jimmy LS Ret. @236651 miles

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