BUMP, DEAD!!, help
06-16-2001, 09:08 PM
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BUMP, DEAD!!, help
Hit a hidden deep pothole on my extended drive home from getting the Shark aligned and lost power. I have tried jumping the fuel relay and that didn't work. Right after it died it would actually fire like it was going to start and then die. Had to bring her home on a flat bed.
Oh and to all you Newberg OR hoot'n & hollern hicks, the Shark will be running again soon and you will still be just.. hicks.
Jim
89S4
Oh and to all you Newberg OR hoot'n & hollern hicks, the Shark will be running again soon and you will still be just.. hicks.
Jim
89S4
06-16-2001, 11:08 PM
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Nope, couldn't find anything like that. When I turn my key on I don't hear any pump noise at all. I'm surprised that hitting a bump would make my pump go out!!??
Jim
Jim
06-17-2001, 06:14 PM
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I had a similar problem on my '85. Turned out to be a loose plug at the bottom of the fuse box. Take a look at the series of plugs that run along the bottom of the fuse box. They are supposed to have a tab that keeps them from falling out but for whatever reason this broke on one of my plugs.
On my car it was the "W" plug (right-most plug)....it also fixed a false t-belt warning that I had been unable to get rid of!! On my car the plug was barely even in the slot.
Good Luck!!
On my car it was the "W" plug (right-most plug)....it also fixed a false t-belt warning that I had been unable to get rid of!! On my car the plug was barely even in the slot.
Good Luck!!
06-19-2001, 03:30 PM
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It seems that you found at least one of the problems with the exterior fuel pump. This pump doesn't turn on when the ignition is turned on, you actually must engage the starter (momentarily) to get the pump to pressurize the system.
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06-19-2001, 11:47 PM
#8
Jim,
It sounds like you have a similar problem I had with my 90 S4. I was driving along on cruise control around 70 MPH and the car started to slow down going up a hill. Put the foot on the accelerator and it was already flat to the floor.
Crested the hill and coasted down the other side and pulled off into a lay-by.
Started fault finding and ended up jumping the fuel pump relay and all I got was a hot fuel pump with no rotation, so insufficient pressure at the fuel rail and engine would not start.
I slackened off the union to the fuel rail and still some fuel pressure, but insufficient to start the engine.
My suggestion is that the heavy bump has caused some piece of foreign matter to get into the fuel pump and jam the pump rotor.
The only method is to change out the fuel pump, as it is a sealed unit and as a safety precaution the fuel filter as well.
I would also suggest that you check out the in-tank fuel pump and clean the gauze filter and also the tank to insure that you have a completly clean fuel system.
To change the fuel pump and fuel filter go to Porsche Specalists web site as it has great directions and photographs.
http://928gt.com Look under Tips and Links, Fuel.
When I replaced my fuel pump I machined the casing on the old pump apart and took the internals to pieces and I found a piece of blue plastic jamming the rotor.
I made up a muff coupling with "o" ring seals and securing studs and the pump tested OK for running, but still to test with fuel.
As a safety measure when you have the pump out don't try to test it as you will have fuel vapours inside the casing which could cause an explosion. The electric motor is a fully submerged type, so when no fuel it exposes the brushers and commutator and sparking could result.
Tails 90 S4
It sounds like you have a similar problem I had with my 90 S4. I was driving along on cruise control around 70 MPH and the car started to slow down going up a hill. Put the foot on the accelerator and it was already flat to the floor.
Crested the hill and coasted down the other side and pulled off into a lay-by.
Started fault finding and ended up jumping the fuel pump relay and all I got was a hot fuel pump with no rotation, so insufficient pressure at the fuel rail and engine would not start.
I slackened off the union to the fuel rail and still some fuel pressure, but insufficient to start the engine.
My suggestion is that the heavy bump has caused some piece of foreign matter to get into the fuel pump and jam the pump rotor.
The only method is to change out the fuel pump, as it is a sealed unit and as a safety precaution the fuel filter as well.
I would also suggest that you check out the in-tank fuel pump and clean the gauze filter and also the tank to insure that you have a completly clean fuel system.
To change the fuel pump and fuel filter go to Porsche Specalists web site as it has great directions and photographs.
http://928gt.com Look under Tips and Links, Fuel.
When I replaced my fuel pump I machined the casing on the old pump apart and took the internals to pieces and I found a piece of blue plastic jamming the rotor.
I made up a muff coupling with "o" ring seals and securing studs and the pump tested OK for running, but still to test with fuel.
As a safety measure when you have the pump out don't try to test it as you will have fuel vapours inside the casing which could cause an explosion. The electric motor is a fully submerged type, so when no fuel it exposes the brushers and commutator and sparking could result.
Tails 90 S4
06-26-2001, 02:03 PM
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A late follow up. Replaced exterior, interior fuel pumps and filter. very straight forward job. I had a hard occasional miss at idle that went away too Took the Shark to Bend OR for a week and it ran BBWWWAAAAAAAAAHHHAHAHA!
Jim
Took the Shark to Bend OR for a week and it ran BBWWWAAAAAAAAAHHHAHAHA!Jim
06-28-2001, 09:06 PM
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Congratulations!
Same bump-dead happened to me last month 5 weeks+...
(see "Road Kill?" on old message board), glad to finally see other similars. My car is still down. I changed the fuel pump (was frozen, but reversing polarity OFF the car freed rotor), started once & stopped. Jumping pump relay turned on fuel, but no go. Mechanic has finally tracked down a possible & probable burnt circuit behind the fuse panel. Evidently the fuel pump relay bridging gave power to pump, but not to the injection brain as it did not cross the pump fuse.
Crossed fingers,
DWP
'90GT Black is Black
Same bump-dead happened to me last month 5 weeks+...
(see "Road Kill?" on old message board), glad to finally see other similars. My car is still down. I changed the fuel pump (was frozen, but reversing polarity OFF the car freed rotor), started once & stopped. Jumping pump relay turned on fuel, but no go. Mechanic has finally tracked down a possible & probable burnt circuit behind the fuse panel. Evidently the fuel pump relay bridging gave power to pump, but not to the injection brain as it did not cross the pump fuse.
Crossed fingers,
DWP
'90GT Black is Black