pegged out fuel gauge/Dual fuel tanks

Asked by 302junkie Apr 21, 2013 at 09:34 PM about the 1987 Ford F-150 XLT Lariat Extended Cab LB

Question type: Maintenance & Repair

Fuel gauge is maxed out no matter which tank is selected. Front/Rear. If it were the sending unit then one of them would be accurate but its not.Just bought truck and it was almost on empty so I filled the rear tank and afterward the gauge pegged out way past full.switch to front tank and its pegged out.HELP Please.

1 Answer
177,545

tenspeed answered 11 years ago

The wire going to the sending unit is grounded. -- The fuel gauge is a volt meter with a different face. Twelve volts come in one end and the sending unit changes the ground potential. The changing potential allows the needle to move. When the ire is grounded, the gauge sees zero volts and the needle swings full range. BTW - all electric gauges are the same. Different faces and ranges but all voltmeters.

18 people found this helpful.
Mark helpful

Your Answer:

Related Questions

  • pegged out fuel gauge/Dual fuel tanks 1 Answer

    Fuel gauge is maxed out no matter which tank is selected. Front/Rear. If it were the sending unit then one of them would be accurate but its not.Just bought truck and it was almost on empty so I fille...

    1987 Ford F-150 XLT Lariat Extended Cab LB

    -

    Maintenance & Repair

  • Does one fuel pump operate dual fuel tanks 5 Answers

    Is there one or two fuel pumps for dual tanks truck ran great then I went to accelerate and my truck would not pick up enough fuel to move the truck and would stall. Then it would not pick up...

    1990 Ford F-150 XLT Lariat 4WD LB

    -

    Maintenance & Repair

  • 1990 Ford F150 dual fuel tanks 10 Answers

    I just bought a 1990 f150 xlt lariat. Currently the truck is pulling from the rear gas tank. When I switch to the forward tank, the needle on the gas gauge gets pinned way past full and the truck di...

    1990 Ford F-150 XLT Lariat LB

    -

    Maintenance & Repair

  • Fuel tanks 1 Answer

    Truck running off the front tank and fuel is spilling out of the rear tank. When I switch to the rear the truck dies, and both fuel pumps are new

    1994 Ford F-150 XLT 4WD Extended Cab SB

    -

    Maintenance & Repair

  • 1991 f150 lariet 4x4 dual tanks - do i have an external fuel pump or not? 4 Answers

    pretty sure my fuel pump is out.

    1991 Ford F-150 XLT Lariat 4WD Extended Cab LB

    -

    Maintenance & Repair

Shortcuts

Search Ford F-150 Questions

CarGurus Experts

  • #1
    OJ
    Reputation
    42,520
  • #2
    Gene Arnett
    Reputation
    16,040
  • #3
    Rowefast
    Reputation
    15,860
View All

Find great deals from top-rated dealers

Search

Related Models For Sale

Used GMC Sierra 1500
148 Great Deals out of 7,258 listings starting at $3,950
Used Ford F-250
6 listings
Used Ford Ranger
18 Great Deals out of 1,529 listings starting at $2,888
Used Ford Mustang
65 Great Deals out of 1,259 listings starting at $4,995

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use. Content will be removed if CarGurus becomes aware that it violates our policies.