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MJMarkham
Samba Member
Joined: May 24, 2004
Posts: 542
Location: Parker Co
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 Posted: Mon Jul 17, 2006 6:06 pm Post subject: Fuel Pump: is there a trick |
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Is there a trick to getting my newly rebuild 36hp fuel pump to actually start pumping fuel? I need some advice on priming the system...
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M J Markham
57 Ragtop Oval, 58 Lowlight Coupe
WANTED: Original 58 Ghia Dash Knob |
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DarrylD
Samba Member
Joined: December 10, 2004
Posts: 68
Location: Seattle, WA
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| Posted: Mon Jul 17, 2006 10:20 pm Post subject: |
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Raise the front of the car so fuel runs downhill. That will at least get fuel to flood the pump's diaphram chamber. After that it's a test of whether you (or whoever rebuilt the fuel pump) got the diaphram installed correctly so there's some "pumping" action when the rocker-arm pivots.
The diaphram needs to be installed with a "pre-load" on the rocker-arm as if the drive rod coming out of the engine block is fully extended (that's about 35mm on a 36hp) and the rubber diaphram is totally slack at that point.
Here's a tool I made to assist in assembling a 40hp fuel pump, the principle is the same with the 36hp, just a longer drive rod. Fuel Pump Rebuilding Jig
Darryl D.
My Garage |
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