87 Dually Fuel Gauge - The 1947 - Present Chevrolet & GMC Truck Message Board Network

rickyrqacer · 06-18-2009, 12:04 AM

my 87 CC dually sits a long time between uses, it's been 10 months since on the road, although I do start it once a week, yesterday, I started it up and the fuel level arm goes to the 3 o'clock position, the tanks are full, but it's never indicated like that . .. where should I start looking? switching tanks makes no differance ... I need to fix it in the next week, it's racing time ..

Rick

BLE 'BURBAN · 06-18-2009, 01:07 AM

Check your grounds under the dash and also the ground leads at each tank.

rickyrqacer · 06-19-2009, 02:06 AM

thanks ble ... I did check grounds, still wierd, everything else works on the dash, any other ideas?

77shortybawx · 06-19-2009, 02:11 AM

possibly a mouse chewed through the wire that connects the gauge to the sending unit(s).

BLE 'BURBAN · 06-20-2009, 01:04 AM

Are you sure your selector valve is functioning? The wiring from the sending units to the gauge runs through there as well.
you might also take a multimeter and check the ohms resistance right at the sending units them selves. G.M. fuel tank sending units run the raange of 0 - 90 ohms full to empty. If you know for sure there is fuel in the tank and the sender is in good working order, then with the multimeter grounded good to the frame touch the positive lead to the sender terminal on the top of the tank and check your resistance.

06-18-2009, 12:04 AM	#1
rickyrqacer Toasted Dually Club Join Date: Feb 2008 Location: Long Beach, Ca Posts: 22	87 Dually Fuel Gauge my 87 CC dually sits a long time between uses, it's been 10 months since on the road, although I do start it once a week, yesterday, I started it up and the fuel level arm goes to the 3 o'clock position, the tanks are full, but it's never indicated like that . .. where should I start looking? switching tanks makes no differance ... I need to fix it in the next week, it's racing time .. Rick

06-18-2009, 01:07 AM	#2
BLE 'BURBAN In the Forgotten far North. Join Date: Jul 2007 Location: Anchorage, Alaska Posts: 2,627	Re: 87 Dually Fuel Gauge Check your grounds under the dash and also the ground leads at each tank. __________________ 1987 R3500 CREW CAB DUALLY (BIG RED)Acquired 06/12/2015 1990 chevy suburban V2500 5.7L My cluster Mods-Nov 2007 overhead console Stereo install Round 2 Aug 2009 Heated/turn signal mirror upgrade

06-19-2009, 02:06 AM	#3
rickyrqacer Toasted Dually Club Join Date: Feb 2008 Location: Long Beach, Ca Posts: 22	Re: 87 Dually Fuel Gauge thanks ble ... I did check grounds, still wierd, everything else works on the dash, any other ideas?

06-19-2009, 02:11 AM	#4
77shortybawx Registered User Join Date: Jan 2009 Location: belmond Posts: 22	Re: 87 Dually Fuel Gauge possibly a mouse chewed through the wire that connects the gauge to the sending unit(s). __________________ 1977 Chevy c-10 Scottsdale 1978 Chevy Camaro 1979 Mercury Cougar

06-20-2009, 01:04 AM	#5
BLE 'BURBAN In the Forgotten far North. Join Date: Jul 2007 Location: Anchorage, Alaska Posts: 2,627	Re: 87 Dually Fuel Gauge Are you sure your selector valve is functioning? The wiring from the sending units to the gauge runs through there as well. you might also take a multimeter and check the ohms resistance right at the sending units them selves. G.M. fuel tank sending units run the raange of 0 - 90 ohms full to empty. If you know for sure there is fuel in the tank and the sender is in good working order, then with the multimeter grounded good to the frame touch the positive lead to the sender terminal on the top of the tank and check your resistance. __________________ 1987 R3500 CREW CAB DUALLY (BIG RED)Acquired 06/12/2015 1990 chevy suburban V2500 5.7L My cluster Mods-Nov 2007 overhead console Stereo install Round 2 Aug 2009 Heated/turn signal mirror upgrade Last edited by BLE 'BURBAN; 06-20-2009 at 01:05 AM.



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