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cocopuffsman
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Joined: February 28, 2015
Posts: 76
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 Posted: Sun Jan 21, 2018 3:09 am Post subject: electric fuel pump |
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I have a porsche 32ndix centermount carburetor on a 1835cc vw dual port and electronic ignition instead of points
the problem ive been having is when at idle my rpms seem to rise 1k and when I give it gas the idle goes back down for a second and slowly raises back +1k rpm, Ive noticed that when I turn my electric fuel pump on and off that fixes the issue of raising 1k till the carburetor runs out of gas.
from what I could gather, there must be too much pressure from the fuel pump causing the carb to get too much fuel and idle up till I give the car some gas and releasing the pressure for a second.
the first thing I did from there was buy a new 42s ELECTRIC FUEL PUMP (MICRO) - 2 PSI / 3.5 PSI - 28 GPH - GASOLINE - FOR CARBURETOR, made by mr. gasket.
the issue was not solved by that, could it still be getting too much pressure?
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UK Luke 72
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Q-Dog
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cocopuffsman
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cocopuffsman
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PumaVW79
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| Posted: Mon Jan 22, 2018 5:26 am Post subject: Re: electric fuel pump |
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| cocopuffsman wrote: |
, Ive noticed that when I turn my electric fuel pump on and off that fixes the issue of raising 1k till the carburetor runs out of gas.
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Looks like the fuel level in the bowl is too high. I don't know how the float bowl /needle valve of NDIX carb works, but there must be a way to adjust it. |
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andk5591
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Joined: August 29, 2005
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Location: State College, PA
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| Posted: Mon Jan 22, 2018 5:36 am Post subject: Re: electric fuel pump |
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How are you measuring the fuel pressure? The cheap round pressure gauges are usually close, but not always. You can never just trust what a dial like that says, assuming that is what you are using.
And I agree that is does sound like fuel level is too high in the carb....
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esde
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| Posted: Mon Jan 22, 2018 5:40 am Post subject: Re: electric fuel pump |
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add washer shims under the float valve. The shims have a 1:4 effect on the float height; a .25mm washer will lower the fuel level 1mm. Also check that the float hasn't partially failed..
https://porsche356registry.org/article/46
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cocopuffsman
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