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Discussion Topic:
Fuel Pump Problem?
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kubes40 |
09-19-2011 @ 11:04 AM
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Senior
Posts: 3394
Joined: Oct 2009
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Like Super, I too do not subscribe to the 'siphon back to the tank' theory. Most often, the fuel is evaporating and / or leaking down in to the intake.
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doning |
09-19-2011 @ 9:28 AM
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New Member
Posts: 158
Joined: Nov 2009
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Ok. Thanks Guy's. I think I might just as well buy a whole new pump. MAN! It's an on going thing with this car!
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supereal |
09-19-2011 @ 9:21 AM
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Senior
Posts: 6819
Joined: Oct 2009
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I don't suscribe to the "drain back" theory, but it is certainly true that the pump valves and diaphragm quickly deteriorate in the presence of ethanol. This weakens the pump, if it doesn't stop it altogether, making refilling the carb require lots of cranking. The "vapor pressure" of modern fuel makes it suscepible to rapid evaporation, particularly when it is heated. Low surface tension allows gas to bypass the pump valves if they don't seat completely. If you are unsure whether your pump is "fuel proof", it is a good idea to replace it "just in case".
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doning |
09-19-2011 @ 9:14 AM
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New Member
Posts: 158
Joined: Nov 2009
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JM: The only kit that I saw from Mac's was the rebuild kit for the glass bowl type. I have the earlier design.
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JM |
09-19-2011 @ 8:15 AM
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Senior
Posts: 822
Joined: Oct 2009
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It sounds like the one way valve to stop gas from flowing back from the FP to the gas tank is not working. Maybe you could get Ken CT to sell you a good FP rebuild kit. Or purchase a good rebuild kit from another well known source. I bought some from MAC's that were good and they get their kits from Joblot. JM
This message was edited by JM on 9-19-11 @ 9:05 AM
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trjford8 |
09-19-2011 @ 7:00 AM
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Senior
Posts: 4214
Joined: Oct 2009
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A fuel pump purchased 7 years ago may not be up to handling the job with the change in fuels that we have today. Methanol is tough on rubber parts. The fuel pump diaphram and the flex hose to the pump can both be affected by the new fuel.
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doning |
09-19-2011 @ 3:11 AM
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New Member
Posts: 158
Joined: Nov 2009
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For awhile now, as you probably remember in my past posts, I have a hard start with my 1937 85 HP in the mornings because the gas disappears in my fuel bowl. For the heck of it my father and I attached a brass nipple to the oulet of the fuel pump ( original design ) and installed a clear fuel line and tighted it to one of the radiator support rods and filled the line with gas and marked it. This morning before I went to work the gas in the line is gone! Is this going back into the tank? If so, how could it get by the two valves inside? The fuel pump was purchased new about 7 years ago and this is the first run this year with it. Thanks.
This message was edited by doning on 9-19-11 @ 3:12 AM
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