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Registered User
Join Date: Apr 2011
Posts: 2
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Fuel pump problems?
I just bought my first 914, a 76 2.0 recently and I just got it running. It needs a definite tune up, but I I'm concerned about the fuel pump because when I turn on the key but don't start the engine up, the fuel pump continues to run even after the 1.5 seconds pressure build up I'm used to on fuel injected cars. Is this normal for the 914 or is something awry?
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04-09-2011, 09:54 PM
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Registered
Join Date: Dec 2003
Location: Milky Way Galaxy - 3rd Stone
Posts: 871
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Someone has jumped the relay or wired the pump directly to switched power. Not the way it is supposed to be.
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Ron Meier Backyard Shadetree Mechanic 1974 914/6 conversion with 2.7L (The Grey Ghost) 1973 Chalon with 2.4T MFI (Schlitzalom) All my 4 cylinders are gone 
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04-10-2011, 06:43 AM
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pressue regulator could be the problem as well.
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04-10-2011, 09:04 AM
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914 Geek
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The pressure regulator does not control the fuel pump. The ECU (the "brain") is supposed to, by grounding a wire that connects to one pin on the fuel pump relay. Someone has most likely re-wired the pump so it is always on when the key is on; one popular way to do this is to power it from the coil (+) connection. Look for an extra wire plugged in there.
--DD
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Pelican Parts 914 Tech Support A few pics of my car: http://www.pelicanparts.com/gallery/Dave_Darling |
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04-10-2011, 10:23 AM
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Join Date: Jan 2011
Location: Phoenix, AZ
Posts: 113
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If you have carbs, it will continue to run as long as the ignition is on; at least that is the way mine is wired. If you have stock Fuel Injection, the above comments are correct.
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85 Carrera Coupe |
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04-10-2011, 01:32 PM
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Join Date: Apr 2011
Posts: 2
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Yep the fuel pump was rewired to the coil. Looks like the bottom of the relay board had cracked and the relays weren't working right. Thankfully I had a good spare. Thanks for the help
 Now I just gotta try to change it back to the original config. Wish me luck!
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04-10-2011, 06:14 PM
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Registered
Join Date: Jan 2004
Location: Northern Virginia
Posts: 3,347
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AA sells rebuilt relay boards (not cheap, iirc, around $200 with core charge). I had to replace mine on my '76 a few years ago.
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1970 914-6 Past: 2000 Boxster 2.7, 1987 944, 1987 924S 1978 911SC, 1976 914 2.0, 1970 914 w/2056 |
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04-12-2011, 07:36 AM
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Therapuetic investment
74 Porsche 914 2.0 
