1987 duel fuel tanks electric issues

Discussion in '1973-1987' started by Captain J, Dec 20, 2017.

  1. Captain J

    Captain J Member

    Dec 20, 2017
    Hi, new to this forum.:)
    My truck is 1987 GMC Sierra R3500, with 7.4L and TBI, duel fuel tanks.
    Just got it restored, but I can’t select fuel from both tanks, I don’t hear any clicking sound in the fuel selector valve, nor the sending units. Only when I turn the key to on, I can hear the driver side fuel pump. I checked the electric on the selector switch (no power), checked the electric to the fuel valve selector no power, so are the fuel sending units.
    I’ll be replace both sending units with new ones,
    But why no electric power?
    Any thoughts?:cool:
  2. Jessica

    Jessica Member

    Nov 3, 2018
    I have a 1987 Chevy C10 that has dual fuel tanks the driver side tank works fine, but after 2 fill ups in that tank the fuel was flowing out of the pass tank so we flipped the switch to use the pass. tank and you can hear the fuel pump but instead the truck dies. Please help!!!!
  3. vwnate1

    vwnate1 Member

    Jan 1, 2000
    Time to break out the test light, do not use a meter .

    Either no power to the switch or the changeover valve is gummed up / dirty contacts, like that .

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