fuel gauge stuck past full? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

chevy man · 09-09-2004, 03:11 PM

I'm new to the forum. I have a question, maybe someone has delt with this before.
I have a 78' k20 with dual tanks. my fuel gauge is sittin' at "past full" It dosn't move at all when I switch between tanks.
Any suggestions would help, Thanks.

DBLSPRT68 · 09-09-2004, 07:08 PM

I've had lots of problems lately with my dual tanks. I pulled the wire off the sending unit and noticed the gas guage went to full. Maybe your wire is broken? Check the ground wire also. If it's not the wires, check with you local parts house for new sending units. They must be stuck in the full position. My problem is, even with new sending units, my gas gauge is only reading 1/4 tank, when there is more in them

. Hope this helps. David

cliffsta · 09-09-2004, 10:19 PM

i used to want dual tanks cause i'd only have to fill up once every so often, but after hearing all the trouble folks have with them (on top of the fact i have learned shorties / short steppies aren't ment for dual), i no longer want em.

80BIG10 · 09-10-2004, 08:35 AM

I love my duel tanks. I can pull up to the pump on either side of the truck. Makes it real nice when the gas station is busy.

There is no better filling when driving in BFE when a tank is getting low and just flipping the switch and see the fuel gage going all the way up!

Its just not fun when you have to fill them both up $$$

NeCrOmAnCeR · 09-10-2004, 05:55 PM

You need to check the wire from the guage to the switching valve, and then to the tanks them selves. When a guage pegs full it is because the circuit has to much resistance. This is caused by a broken sending unit wire, bad units, or bad grounds. I am assuming you have checked to make sure the guage has power. When you check the wire at the switching valve, just ground it, the guage should show empty. Hope this helps.

screwballl · 09-10-2004, 09:50 PM

when i fill mine up, it goes WAYYY past F and when it gets to just below 1/4 i know its almost empty.. i let it get to E once and it was rattling so bad and about to die for 50 ft while pulling into the gas station...
it doesnt get stuck but i am afraid that it will someday

DrMaserati · 09-12-2004, 07:45 PM

Since you have dual tanks and it is occuring on both tanks, the most likely problem is an open ground.

09-09-2004, 03:11 PM	#1
chevy man Registered User Join Date: Aug 2004 Posts: 2	fuel gauge stuck past full? I'm new to the forum. I have a question, maybe someone has delt with this before. I have a 78' k20 with dual tanks. my fuel gauge is sittin' at "past full" It dosn't move at all when I switch between tanks. Any suggestions would help, Thanks.

09-09-2004, 07:08 PM	#2
DBLSPRT68 Registered User Join Date: Nov 2000 Location: Ft. Mill, SC USA Posts: 931	I've had lots of problems lately with my dual tanks. I pulled the wire off the sending unit and noticed the gas guage went to full. Maybe your wire is broken? Check the ground wire also. If it's not the wires, check with you local parts house for new sending units. They must be stuck in the full position. My problem is, even with new sending units, my gas gauge is only reading 1/4 tank, when there is more in them . Hope this helps. David __________________ PROJECT TRUCK: 1985 SWB C10 Silverado Black/Charcoal, 1990 V2500 Suburban, 2018 Suburban, 2005 GMC 2500HD CCSB, 2014 Toyota Camry SE, HAD.....1968 Camaro RS/SS Family owned since new; 350 3 speed SOLD

09-09-2004, 10:19 PM	#3
cliffsta Stepsides RULE Join Date: Jul 2004 Location: Pineville, LA Posts: 1,921	i used to want dual tanks cause i'd only have to fill up once every so often, but after hearing all the trouble folks have with them (on top of the fact i have learned shorties / short steppies aren't ment for dual), i no longer want em. __________________ 1981 Chevy C10 Custom Deluxe Stepside 350 V8, headers, side exhausts, 3-speed auto SOLD 1980 Chevy C10 Custum Deluxe Stepside 305 V8, Edelbrock Performer Intake, Edelbrock 1406 600CFM 4-barrel, TH350C. Bent rod. SOLD 1984 GMC Sierra Classic Longbed 6.2L Diesel SOLD 2009 Kawasaki KLX-250S too many mods for this signature 1999 Honda Accord EX 4-cylinder, 17" Motegi Wheels 215/45/17 Sumitomo tires, Tein S-Tech lowering springs, KYB GR2 shocks, Acura TL 20mm rear swaybar, debadged, blackhoused headlights, Short-Ram Intake Cardomain of the Accord

09-10-2004, 09:50 PM	#6
screwballl Tonawanda 454 Join Date: Mar 2004 Location: Liquid Sunshine State Posts: 2,754	when i fill mine up, it goes WAYYY past F and when it gets to just below 1/4 i know its almost empty.. i let it get to E once and it was rattling so bad and about to die for 50 ft while pulling into the gas station... it doesnt get stuck but i am afraid that it will someday __________________ 91 Chevy Suburban Tonawanda 454 R2500 - SOLD!!! 04 Dodge Durango 5.7L Hemi 2WD, 24K miles (as of July 2011) In the past 30 years about 90% of Fords are still on the road, the other 10% made it home. -------------------

09-12-2004, 07:45 PM	#7
DrMaserati Village Curmudgeon Join Date: May 2003 Location: Salem, OR Posts: 75	Since you have dual tanks and it is occuring on both tanks, the most likely problem is an open ground. __________________ 78 Chevy K30 duallie, 454, TH400 78 IH Scout II, 4X4, 345, 727TF 76 IH Scout II, 4X4, 345, 727TF 65 IH 1200C pickup, 4X4, 345, 4 spd 48 IH KB-8-F, RD-450, 5 spd, 35,000 GVW (a REAL truck) "Life is too short to drink cheap beer." Harry S. Truman

09-10-2004, 08:35 AM	#4
80BIG10 3 lefts make a right Join Date: Jun 2004 Location: Texas Hill Country Posts: 150	I love my duel tanks. I can pull up to the pump on either side of the truck. Makes it real nice when the gas station is busy. There is no better filling when driving in BFE when a tank is getting low and just flipping the switch and see the fuel gage going all the way up! Its just not fun when you have to fill them both up $$$

09-10-2004, 05:55 PM	#5
NeCrOmAnCeR Registered User Join Date: Feb 2004 Location: Hodgenville, Ky Posts: 735	You need to check the wire from the guage to the switching valve, and then to the tanks them selves. When a guage pegs full it is because the circuit has to much resistance. This is caused by a broken sending unit wire, bad units, or bad grounds. I am assuming you have checked to make sure the guage has power. When you check the wire at the switching valve, just ground it, the guage should show empty. Hope this helps.



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