After 8 months, Kermit is ALIIIIIVE again! - Question about fuel leak(s)
04-01-2005, 01:02 PM
#16
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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."
04-01-2005, 02:36 PM
#18
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Fuel leaks stopped!
As it turns out, it wasn't the strainer after all. There was a loose connection at the 2nd fuel pump behind the right rear tire leaking down into the tank strap making it appear to be the strainer.
The leak at the fuel filter was fixed thanks to my buddy DR! On his recommendation, a little yellow teflon tape and another new crush ring and no more leak. Thanks DR, you ARE the man!
Now, I need to figure out why when the rpms get above 2000 its starts to miss and the engine seems bog down. Any suggestions?
As it turns out, it wasn't the strainer after all. There was a loose connection at the 2nd fuel pump behind the right rear tire leaking down into the tank strap making it appear to be the strainer.
The leak at the fuel filter was fixed thanks to my buddy DR! On his recommendation, a little yellow teflon tape and another new crush ring and no more leak. Thanks DR, you ARE the man!
Now, I need to figure out why when the rpms get above 2000 its starts to miss and the engine seems bog down. Any suggestions?
04-01-2005, 02:56 PM
#20
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Kermit -- droooooolllllll. Garage -- droooooolllll.
The bogging above 2000 sound like fuel starvation. I know the car has sat a lot for a long time. You've sorted the tank, filter, pumps, but what about the rest of the circuit from the pump, to the jetronic, to the injector lines to the injectors? If it's on all cylinders, focus on the supply to the jetronic unit, and the big damper diaphram. That diaphram and the plunging sensor in the side can get sticky, and clogged. A fuel pressure gauge and test kit is useful here. You've got spark, you've got compression, you've got enough fuel at idle, but under demand, things go bad. Starvation is my guess.
Others?
The bogging above 2000 sound like fuel starvation. I know the car has sat a lot for a long time. You've sorted the tank, filter, pumps, but what about the rest of the circuit from the pump, to the jetronic, to the injector lines to the injectors? If it's on all cylinders, focus on the supply to the jetronic unit, and the big damper diaphram. That diaphram and the plunging sensor in the side can get sticky, and clogged. A fuel pressure gauge and test kit is useful here. You've got spark, you've got compression, you've got enough fuel at idle, but under demand, things go bad. Starvation is my guess.
Others?
04-01-2005, 08:12 PM
#22
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Yep, there's screens everywhere... each port in the FD, one in the WUR, one at the tank; does sound like it's starving. Especially if it's either warm or cold. You should have close to 70 lbs of pressure with 2 pumps (I assume you have 2 pumps). Fuel return test at the top of the tank is a really good, easy test. You should get a ton of fuel in less than 30 seconds. Mixture could be way off too. Richen (clockwise) til it starts to hunt, back it off til it quits hunting. That's a good get it close til you can put a sniffer on it.
Bee-yoo-tee-mus 928, Chuck. What a sweetheart. I'd love it even more if it were Kawasaki green. lol
Bee-yoo-tee-mus 928, Chuck. What a sweetheart. I'd love it even more if it were Kawasaki green. lol
04-01-2005, 08:45 PM
#23
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Status update:
After running the car for about 45 minutes to cure some of the heat paint on the exhaust system it seems the rough running problem above 2k rpms has gone away. Right before I put it up on jack stands I had put a can of injector cleaner in the tank and that is when the problem started. When I drained the gas out to remove the tank most of the injector cleaner went in to my Trailblazer. Perhaps, whatever the injector cleaner dislodged went through the system and now there is fresh gas flowing? Make any sense? Perhaps not but whatever happened it seems fine now. Stay tuned.
Here are a couple more pictures from its first time outside since last July....
Now its on to finishing the project in the last three pics.
After running the car for about 45 minutes to cure some of the heat paint on the exhaust system it seems the rough running problem above 2k rpms has gone away. Right before I put it up on jack stands I had put a can of injector cleaner in the tank and that is when the problem started. When I drained the gas out to remove the tank most of the injector cleaner went in to my Trailblazer. Perhaps, whatever the injector cleaner dislodged went through the system and now there is fresh gas flowing? Make any sense? Perhaps not but whatever happened it seems fine now. Stay tuned.
Here are a couple more pictures from its first time outside since last July....
Now its on to finishing the project in the last three pics.
