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Join Date: Mar 2006
Location: louisville
Posts: 1,317
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Fuel pump question
Alright maybe someone can chime in let me start from the beginning About a month ago I purchased a 77 911 motor removed sitting for five years behind someone garage Ok got it home installed engine wont start fuel pump locked up wont pump purchased new bosch pump 300.00 got it home installed wont pump, checked voltage to pump 12.6 volts cranking at the pump still no fuel flowing removed jumped it to battery starts pumping
car now runs drove it for a week no problems except fuel leak from pressure line order line install car starts up crush washers are leaking so tighten them a little more now car wont run pump is spinning inside but not flowing any fuel (there is gas in the tank) anyone have any ideas
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Tony Proasi 1969S 1957 VW Pickup |
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08-18-2006, 05:22 PM
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Location: Westfield, New Jersey
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I've found that when these pumps sit, they tend to gum up inside causing the rotor not to spin, which may have caused your initial problem. That or the power lead was corroded and not making good contact with the pump. As for the crush washers, that one is odd. Does the 911 pump even have banjo fittings for crush washers? Possibly some rust or dirt got trapped inside and tightening the fuel line somehow blocked the passage. My sugesstion is to remove and disassemble the pump. the top part houses the rotor and 3 or 4 steel rollers inside the rotor. You don't need to go any further with the disassembly. Flush the pump with fresh gas and blow out the fuel inlets and motor with compressed air. Replace the rotor and see if it turns freely and if you can feel the magnet cycles of the motor when you are turning it. Reassemble and bench test. Wire brush all the contacts including the wires from the car. If it still doesn't work get a new pump. Good luck
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1971 911S, 1974 914 2.0, 1999 Boxster, 2003 Boxster, 2008 Cayman S. www.TheLolaRegistry.com "When you think you are in full control, you're just not going fast enough." |
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08-18-2006, 08:40 PM
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If the new pump's running and it flowed fuel and now it doesn't, maybe the filter in the tank is clogged. It's the large allen head fitting on the bottom of the tank. I believe a 3/4 or 7/8" allen wrench fits it. You'll need to syphon the fuel out first.
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2014 Cayman S (track rat w/GT4 suspension) 1979 930 (475 rwhp at 0.95 bar) |
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08-19-2006, 05:39 AM
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Location: louisville
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I don't think the in tank filter is clogged cause It flows out of pump inlet line real good
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Tony Proasi 1969S 1957 VW Pickup |
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08-19-2006, 07:50 AM
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1979 Porsche 930 3.4
