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1966 mgb fuel pump run on

Posted by dougwec

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1966 mgb fuel pump run on #1
dougwec doug wechsler new jersey, USA	Posted: June 22, 2012 07:04AM Registered: 3 years ago Posts: 43

My '66 MGB fuel pump delivers gas but continues to click as if it is running on. Anyone have any ideas on the fix - air leak, diaphram?

Thanks

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Re: 1966 mgb fuel pump run on #2
Lee Lee Miller Mburg, PA, USA 1966 MG MGB 1967 MG MGB 1971 MG MGB	Posted: June 22, 2012 07:18AM Registered: 13 years ago Posts: 4,190

Do you know if it is an SU pump or after market? Aftermarket pumps will tick all the time.

Lee Miller

Experience - hobbyist, rotisserie restoration 1967 MGB, welding, bodywork, painting, wiring, interior, suspension, clutch, engine, SU HS4 carburetors, windshield, and installing convertible top.

Website www.myclassicmg.com

1971 MGB
1967 MGB
1966 MGB restoration project

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Re: 1966 mgb fuel pump run on #3
dougwec doug wechsler new jersey, USA	Posted: June 22, 2012 07:27AM Registered: 3 years ago Posts: 43

Original equipment pump

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Re: 1966 mgb fuel pump run on #4
ClayJ Clay Johnston Mt. Olive, MS, USA 1972 MG MGB	Posted: June 22, 2012 08:04AM Registered: 7 years ago Posts: 7,434

Either the pump is failing or you have fuel leaking somewhere.

If there's no puddle of fuel under the car...

Pull the vent hoses on the carbs, these should be dry. If either is spitting fuel or wet you need to service the carb floats/float needles.

I would flow test the fuel supply at the carbs. Pull the delivery line at the carbs and redirect into a gallon jug. With pump on you should get about a quart of fuel in 30sec.

Another check, remove the dash pots, turn the pump on. You should not see fuel flowing into the throat. If so, you need to service the float/float needle.

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Re: 1966 mgb fuel pump run on #5
ddubois Dave DuBois Bremerton, WA, USA	Posted: June 22, 2012 12:48PM Registered: 7 years ago Posts: 4,370

Doug - You could have an air leak on the inlet side of the pump (no fuel will leak out) or on the pump itself. To check for an air leak, remove the fuel line at the carbs and direct it into a container, then turn the ignition on and see if the stream of fuel is full of bubbles - if it is, start checking for a loose connection at the tank of the pump, or a crack in the line between the two. Also check that the gasket under the large dome cover (held in place by a single hex head screw on the right side of the pump). Finally, if there is no air leak, you will need to check the inlet and outlet valves in the pump for any debris under the reeds or a cracked reed.
Cheers,

Dave DuBois
1953 MGTD
1966 MGB
http://homepages.donobi.net/sufuelpumps/

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SU Fuel Pumps & More SU fuel pump restoration and conversion to solid state. Information and technical articles on SU fuel pumps.

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