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Registered
Join Date: Apr 2008
Location: Portland, OR
Posts: 35
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Fuel Pump Issue
I have a '74 1.8 914. It currently accelerates like a bandit but runs rough at constant throttle. The fuel pump runs all the time with the ignition switch on and engine not running. Where to look first?
Gennaro |
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08-05-2013, 03:35 PM
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914 Geek
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Injected or converted to carb(s)?
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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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08-05-2013, 05:51 PM
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Registered
Join Date: Apr 2008
Location: Portland, OR
Posts: 35
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Injected. EFI-L
Gennaro |
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08-05-2013, 06:15 PM
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914 Geek
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The pump is supposed to run when the starter is cranking, and also when the flap in the air-flow meter is open. If it runs all the time, someone has done some re-wiring. It is possible that they changed other things that might be causing your running problems.
However--the first thing to do is to make sure that the basic engine is in good shape. Are the valves adjusted in spec, does the engine have decent compression, etc. Then check the timing and make sure it's in spec. Then look for brittle or disconnected wires or vacuum hoses. The L-jetronic EFI really hates vacuum leaks. Check the big rubber "boot" between the air flow meter and the throttle body; it likes to crack in between the ribs/pleats. The crankcase is also part of the vacuum system, so make sure that the seals in the oil cap are there and working. And check the seals around the fuel injectors, they can dry out and leak. Good luck! --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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08-05-2013, 08:24 PM
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Registered
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If the cover on the air flow meter has ever been removed for tuning, the fuel pump shutoff switch may be inactive.
An arm on the wiper ass'y opens a microswitch when there is no airflow thru the meter. The arm can be carefully rebent to contact the switch if it has been altered. Any time the mixture has been adjusted by repositioning the wiper ass'y the shut of switch arm needs to be adjusted.
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Chris Foley CFR-Tangerine Racing Products, LLC - 914 Products and Services |
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08-06-2013, 10:08 AM
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Control Group
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L jet is also very sensitive to air leaks too.
Mr Foley, you have some cool ass stuff on your site.
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She was the kindest person I ever met |
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08-08-2013, 03:41 PM
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Quote:
I always have more in the works as well. One of the newest projects is a hand throttle kit like oem (914-6) - for anyone who didn't get one from the factory.  :/hijack:
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Chris Foley CFR-Tangerine Racing Products, LLC - 914 Products and Services |
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08-09-2013, 09:57 AM
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74 Porsche 914 2.0 
1970 Porsche 914 1.7liter 
2004 Mazda Miata
