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924/931/944/951/968 Forum Porsche 924, 924S, 931, 944, 944S, 944S2, 951, and 968 discussion, how-to guides, and technical help. (1976-1995)
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Old 05-02-2009 | 05:15 PM
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Just thought I'de throw this out there. I've been having a problem with intermittant no fuel pressure. Tracked down a bad DME relay. After replacing the relay, I still had the fuel pressure problem. In messing around in the fuse box I found that if I pushed hard on the fuel pump fuse (#34) I could get the pump to come on. I pulled out the fuse and it was still good, but the metal tabs of the fuse had some black arcing spots on them. (See the picture) I cleaned both sides of both tabs, then coated them with a layer of fresh solder. Put the fuse back in.....tada....problem solved and wiggling the fuse does not cause the pump to cut out any more. So, just because a fuse meters as good, look at the tabs to make sure they are nice and clean and the fuse seats into it's slots well.

Last edited by Funn944; 01-24-2011 at 01:39 PM.
Old 05-02-2009 | 06:34 PM
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hmm... those black marks look rather MSPaint'd on to me. =)

I kid.

But glad to hear you got your fuel issue sorted out. I just figured my problem out, too. Congrats!


(Scurries off to the fusebox for prevent. maint.)
Old 05-02-2009 | 08:04 PM
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BOOOOBBBBIIIIIEEEEEESSSSSSSS
Old 05-02-2009 | 09:18 PM
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Ya, those are p-shopped in the pic, but it's just to give you an idea what it looked like. By the way, I never really realized how loud the fuel pump is when it's running.
Old 05-03-2009 | 11:47 AM
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I'd be less concerned with the (cheap) fuse, and more concerned with the contacts in your fuse box. Get on in there and clean them, and make sure they are tight enough (may require some bending back into shape). If you fold a small strip of 400 grit sandpaper around a flat blade screwdriver, you can get into bladed fuse contacts pretty easily to clean them. Then you can get the contact cleaner involved, etc. I had several that needed that treatment in my (flood) car, and ended up doing the whole box that way. Some gremlins must have evaporated along with the contact cleaner, and the rest were hiding in the ignition switch that I changed. Because everything other than my fuel gauge has been fine since then (and I'm too cheap to buy a new tank sensor when the trip odometer works perfectly well).



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