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MFI electric fuel pump lines
In the process of going from Webers back to MFI I have had several issues. The most current and hopefully the last one is hooking up lines from the electric fuel pump to the (supply), to engine (delivery), and return.
I have a rebuilt/new pump from Fuel Injection Corp. When I hook it up the return line is actually supplying fuel to the engine. Not sure why or if that is a problem. Any thoughts (other than calling the remanufacturer)? Does it really matter since fuel is going to the engine bay? Thanks, Matthew One of these days I may go back to the ease of working on old BMWs... 
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Matthew - drove Nurburgring with wipers on and no rain 1969 911E SOLD  2002 996 Cabrio 1995 993 Carrera 4 SOLD 2004 Land Rover Discovery II G4 Edition (Sold )
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10-05-2013, 04:09 PM
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Really? You have a rebuilt pump that's providing pressurised fuel out the return line? (The outlet closest to the electrical terminal by the relief valve assembly) The pressure feed is the middle outlet, fuel only flows from the relief outlet when the pressure outlet is blocked, although often there is a dribble of fuel from the relief outlet, which is normal.
The fuel lines need to be like the following diagram, no exceptions. 
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1972 911T Coupe with a '73E MFI engine and 'S' pistons 10 year resto mostly completed, in original Albert Blue. ***If only I didn't know now what I didn't know then*** |
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10-05-2013, 11:01 PM
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Join Date: Dec 2000
Location: The Hague, Netherlands
Posts: 806
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Had a similar thing with a rebuild pump, one outlet (the middle one) was a dead-end. Apparently some fault in manufacturing.
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Peter '13 981S '73 911T '05 996 4S cab, now gone '70 911S Targa, now gone |
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10-06-2013, 01:45 AM
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1972 Porsche 911T
