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MGB 72 MGB Fuel Pump

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M

MGBobM

Freshman Member
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The fuel pump clicks continuously with the engine off.
With motor running it still clicks all the time. Everything seems fine no fuel leaks anywhere.
Can someone give me a diagnosis on this.
Thanks,
Bob
72 MGB GT
 
First question is --Is it an original type pump? Some of the solid state aftermarket pumps don't stop. Next, if it is an original, the leak is probably on the pickup side or maybe there is a slight split or leak in the diaphram. Trash in the valves?? Is it coming up to pressure? At least 2 lbs approximately. Also the needles in the carbs might not be cutting the fuel off properly. I converted mine to gross jets.
I am replacing the points in mine right now (also a '72) and ran into a mod on line you might want to put in there if you are taking yours apart. Replace the capacitor with a diode which will prevent points burning better than the capacitor. Check out the picture on this site. I think a 1 amp diode from radio shack will work. https://www.chesapeakechaptermgtclub.com/tech/FuelPumpTuneUp.htm
Bob
 
Thanks for the advice. The pump appears to be aftermarket where continual running is normal. Ran into a local MGA owner who has the same experience with his pump. Will look into adding the diode.
Thanks again for the help.
Regards,
Bob
 
Mrbassman, the diode required must have a capacity of 3 amps or better and have a working voltage of not less than 200 Volts. However, this lister seems to have an after market pump that can not benefit from the changes introduced for the SU component.-Keoke
 
[ QUOTE ]

Mrbassman, the diode required must have a capacity of 3 amps or better and have a working voltage of not less than 200 Volts. However, this lister seems to have an after market pump that can not benefit from the changes introduced for the SU component.-Keoke

[/ QUOTE ]

You are right, sorry I missed that in the article. I just reread it. Yes, also right is this diode is only for the SU pump. No benefit will result using it with an aftermarket.
Bob
 
HI "MG" Bob, I think you should look into why the pump keeps running when the car ignition is off. This would seem to put an unnecessary strain{Discharge} on the battery when the car is not being used. Also see my response to the other Bob-FWIW---Keoke
 
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