Leak after fuel filter replacement
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Under the Lift
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From: Buckeye, AZ
Leak after fuel filter replacement
Anybody had this happen? I replaced the fuel filter and the in-tank fuel pump. Didn't touch the external fuel pump. Buttoned it up. Observing it shows a very slow leak at the the fuel pump outlet. It's wetting and dripping off the end nut. I THINK it's coming from the pipe above it, where the arrow is pointing. Note the pipe is crimped/brazed? into the fitting there. When you remove the other end of this rigid line from the fuel filter it can put some stress on this point, I guess. I should have loosened the fuel pump so it could have moved with the line as I removed it from the fuel filter. Actually, I recall I had the fuel filter was loose, so I can't quite figure out how I created this leak. I only tweaked on this line a little when refitting to get it to line up and go back on to the filter. Dang!
Drifting
Joined: Sep 2001
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From: Bountiful, Utah
Chances are you loosened the check valve during your playing down there. The end nut may be tight but it must be removed to properly tighten the checkvalve. I have broken them loose by just bumping the fuel pump.
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From: Nova Scotia
I'd be tempted to try an ~ 1/8 turn on the nut to get a better crush on the copper gaskets first .... or 'refresh' the gaskets ( anneal by heating or new). Gas under pressure is so mobile that it's difficult to pinpoint the leak. Perhaps with the fuel pump jumpered and a stream of compressed air handy, the area can be 'blasted' to better see the leak.
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From: Buckeye, AZ
I think I'll clamp off the tank outlet hose and take this apart and anneal as you suggest, Garth. I probably should have taken the opportunity to replace the check valve anyway. Also, you will notice this is the original pump (green) at 155K miles.
Thanks, you guys. I was going to look into replacing that line, but you've steered me in the much more likely correct direction.
Thanks, you guys. I was going to look into replacing that line, but you've steered me in the much more likely correct direction.
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Burning Brakes
Joined: Oct 2004
Posts: 877
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From: Suburban St. Louis in Illinois.
I just had this same issue yesterday...Changed the fuelfilter...and started leaking a the pump discharge banjo bolt. There are copper crush washers on either side of the banjo bolt .You have to take the pump and filter off the car...get the nut broke loose on the outboard side of the banjo bolt, then using a screwdriver between the positve electrcal connector on the pump, and the pumps discharge port, hold and prevent the pump from turning while you tighten the nut on the outboard side of the banjo bolt. Tighten the nut up till the copper crush washers are snug to tight...then reinstall the pump and filter assembly, and all will be good...
Burning Brakes
Joined: Oct 2004
Posts: 877
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From: Suburban St. Louis in Illinois.
Bill...if you refuse to use the screwdriver to hold the pump as I previously suggested...take a 17 mm open end wrench, and using your Dremel...grind the "ears" down till it will slip over the flat sides of the nut, and still slide between the terminals..I have done this to more than a few wrenches to hadle similar circumstances... 
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From: Australia
I have found it easiest to replace filter by removing whole pump/filter assy from car and do it on the bench. Then you are not compromised in getting correct access to all nuts for counter holds etc. The S pipe is very easy to twist and damage - recently replaced mine. Only extra work is r&r the electrical connections to the pump.
jp 83 Euro S AT 50k.
jp 83 Euro S AT 50k.
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From: Double Oak, TX
Bill,
Exactly the same issue on my GTS.
Leaking fuel - tighten banjo - think I have fixed it - no it still leaks - then I find the check valve is loose.
I also changed all the crush washers for good measure.
Close up of my patent design spanner (wrench) for the job.
I am thinking about reproducing the spanner and selling on eBay - not.
Exactly the same issue on my GTS.
Leaking fuel - tighten banjo - think I have fixed it - no it still leaks - then I find the check valve is loose.
I also changed all the crush washers for good measure.
Close up of my patent design spanner (wrench) for the job.
I am thinking about reproducing the spanner and selling on eBay - not.
__________________
Does it have the "Do It Yourself" manual transmission, or the superior "Fully Equipped by Porsche" Automatic Transmission? George Layton March 2014
928 Owners are ".....a secret sect of quietly assured Porsche pragmatists who in near anonymity appreciate the prodigious, easy going prowess of the 928."
Does it have the "Do It Yourself" manual transmission, or the superior "Fully Equipped by Porsche" Automatic Transmission?
George Layton March 2014928 Owners are ".....a secret sect of quietly assured Porsche pragmatists who in near anonymity appreciate the prodigious, easy going prowess of the 928."
Last edited by ROG100; Jul 28, 2009 at 05:21 PM.