1987 Chevy Silverado

Tiny
CHEVYKING
  • MEMBER
  • 1987 CHEVROLET SILVERADO
1987 Chevy Silverado Four Wheel Drive Automatic

I own a 1987 chevrolet silverado. This truck contains two fuel tanks and a switch that switches between each fuel pump. I really need to know if this switch serves any other purpose besides switching between fuel tanks.
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No
Sunday, May 4th, 2008 AT 8:04 AM

5 Replies

Tiny
SHARTLEY50
  • MEMBER
That is all it is meant for. It does not operate anything else.
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Sunday, May 4th, 2008 AT 11:19 AM
Tiny
SHARTLEY50
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Forgot to mention, you have only one fuel pump, not one for each tank.
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Sunday, May 4th, 2008 AT 11:21 AM
Tiny
CHEVYKING
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Well my truck contains two fuel pumps(one in each tank).I have checked fuel pumps, I have replaced the fuel pump relay switch. The truck isnt recieving fuel to the fuel injectors or throtle body. The computer on the truck isnt giving information on the status of the truck. The computer is working properly because it gives me the diagnostic code (which is 12). I have run a hot wire form battery to both fuel pumps and I hear them both come on. Only if I run the hot wire from the battery to the fuel pumps.
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Sunday, May 4th, 2008 AT 12:13 PM
Tiny
SHARTLEY50
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Sorry guy. Mine only has one and is not fuel injected, thats what I was going on. Could be inline gas filters, but I'm sure you've checked that. When you hot wire each pump, does fuel come out the line going to the injectors?
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Sunday, May 4th, 2008 AT 8:55 PM
Tiny
CHEVYKING
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Yes, the fuel does come out of the line. The switch that switches between the tanks has five wires going to it. When I un-plug the switch the gas hand goes counter clockwise way past the fuel mark. When I plug it back up it goes back to the fuel mark. How many volts should the fuel pumps be recieving? I am only getting 8. Something is telling the truck n ot to send fuel to the fuel injection system. The battery went bad in the truck. Before that battery went bad evrything was working properly. When I replaced the battery is when the fuel system stopped working properly. The truck turns over, the blinkers work, the lights work, etc. Everything works except the fuel system.
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Monday, May 5th, 2008 AT 4:28 AM

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