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61
American MGB Association Members Usage and Benefits / Gas gauge problem
« Last post by june2021 on June 22, 2021, 08:51:21 PM »
I have a 1975 MGB Roadster. When my gas tank if full the gas gauge registers 1/2 full. I have replaced the sending unit as well as the gauge itself and have the same result. I have also jumped the wiring (ground wire etc.) also with the same result. Could there be an obstruction in the tank preventing the float from full movement? Any advice would be appreciated. Don Pohlmann
62
American MGB Association Members Usage and Benefits / Re: Gas gauge problem
« Last post by Art on June 23, 2021, 08:26:40 AM »
Hi Don,

With all you've done up to now, I'd start by again checking the wiring over its entire length from the tank to the instrument panel.  Make sure the gage and sender are properly grounded.

Damaged insulation or a pinched wire could cause a ground which might throw-off the signal and reading.  Your car is over 45 years old and these things do happen.

If you have the OEM gas tank still installed, it would have baffles internally. Maybe one is loose in then tank that is restricting the float's movement.  Problem is that the only way to check that is to drain the fuel, remove the sender and then fish around the inside of the tank to see if anything is in the way.  Almost as much work as replacing it.

I also see there are several sending units listed for later cars, so make sure you have the right one.  The (3) tanks listed as the same for 65-up, just different suppliers and the OEM style is baffled, so I doubt the fit with any is an issue, but see my comment earlier on the baffles. 

Hope that helps you.  Let us know what you find.

Safety Fast!

Art

63
American MGB Association Members Usage and Benefits / Gas gauge problem
« Last post by june2021 on June 22, 2021, 08:51:21 PM »
I have a 1975 MGB Roadster. When my gas tank if full the gas gauge registers 1/2 full. I have replaced the sending unit as well as the gauge itself and have the same result. I have also jumped the wiring (ground wire etc.) also with the same result. Could there be an obstruction in the tank preventing the float from full movement? Any advice would be appreciated. Don Pohlmann
64
B roadsters rubber-bumpered ('75 to '80) / Re: Gas gauge problem
« Last post by Art on June 23, 2021, 08:26:40 AM »
Hi Don,

With all you've done up to now, I'd start by again checking the wiring over its entire length from the tank to the instrument panel.  Make sure the gage and sender are properly grounded.

Damaged insulation or a pinched wire could cause a ground which might throw-off the signal and reading.  Your car is over 45 years old and these things do happen.

If you have the OEM gas tank still installed, it would have baffles internally. Maybe one is loose in then tank that is restricting the float's movement.  Problem is that the only way to check that is to drain the fuel, remove the sender and then fish around the inside of the tank to see if anything is in the way.  Almost as much work as replacing it.

I also see there are several sending units listed for later cars, so make sure you have the right one.  The (3) tanks listed as the same for 65-up, just different suppliers and the OEM style is baffled, so I doubt the fit with any is an issue, but see my comment earlier on the baffles. 

Hope that helps you.  Let us know what you find.

Safety Fast!

Art

65
B roadsters rubber-bumpered ('75 to '80) / Gas gauge problem
« Last post by june2021 on June 22, 2021, 08:51:21 PM »
I have a 1975 MGB Roadster. When my gas tank if full the gas gauge registers 1/2 full. I have replaced the sending unit as well as the gauge itself and have the same result. I have also jumped the wiring (ground wire etc.) also with the same result. Could there be an obstruction in the tank preventing the float from full movement? Any advice would be appreciated. Don Pohlmann
66
Annual Charleston British Car Day, Palmetto Islands Park, SC. www.britishcarclubcharleston.com
67
South Alabama British Car Club Festival, Fairhope, AL. www.sabcc.org
68
Upcoming Show Announcements / Oct. 9, 2021 - Brits in the Ozarks, Springdale, AR
« Last post by amgba on June 21, 2021, 07:47:26 PM »
Brits in the Ozarks, Springdale, AR. www.britishironnwa.org
69
Upcoming Show Announcements / Oct. 9, 2021 - Brits at the Village, Lahaska, PA
« Last post by amgba on June 21, 2021, 07:45:29 PM »
Brits at the Village, Lahaska, PA. www.PhillyMGClub.com or Kristi at 484-686-3305
70
Upcoming Show Announcements / Oct. 2, 2021 - All British Car Show, Chattanooga, TN
« Last post by amgba on June 21, 2021, 07:43:24 PM »
All British Car Show, Chattanooga, TN. www.southernbritishcarclub.net
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