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Registered
Join Date: Aug 2005
Location: Phoenix
Posts: 21
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911 ('74) fuel pressure HELP!?!
Rebuilt 2.7 from '74 911. ported heads and added 3.0l CIS system. Upon startup, and subsequent warm-up, the engine seems to lean out. So, we installed a pressure gauge between the warm-up regulator and the CIS fuel distributer. fuel pressure starts off around 48-50 psi, then what happens next is haphazard at best, it will jump to line pressure or near 80psi and stay, or it will drop to 28lbs and dance around there. I've not kept it running too long in this state as I want to sort it out quickly so I can properly break it in.
Perhaps I brought this on myself, messing with the CIS, but I hope I can get some solid suggestions from this group. Thanks, Brent
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Brent Wittke _______________ '67 911 to '73 RSR conversion '88 911 Cab '02 Boxster |
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09-07-2008, 09:20 AM
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Designer King
Join Date: Mar 2004
Location: Toronto, ON Canada
Posts: 5,499
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I don't know what your cold cp should be for a 74 but even in hot AZ it seems like 3 bar+ is too high. Your WUR may be set incorrectly or may be clogged. The bimetal strip may be bad. Check the strip via the connections @ the top of the WUR for resistance. As long as there is some you are probably OK. Make sure the WUR is getting power. Check the fuel connections@ the top. There is a screen in there that can get clogged.
After the WUR I would move on to the fuel filter and lines, the injectors, and then the fuel distributor.
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Paul Yellow 77 Sunroof Coupe/cork interior; 3.2L SS '80 engine/10.3:1/No O2; Carrera Tensioners; 11 Blade Fan; Turbo tie rods; Bilstein B6; 28 tube Cooler; SSI, Dansk; MSD/Blaster; 16x7" Fuchs/205/50 Firestone Firehawk Indy 500s; PCA/UCR, MID9 Never leave well enough alone |
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09-07-2008, 09:52 AM
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