924Board.org

[924s167]

i've searched and found lots on what might be wrong but i have another Q?

where can i find this "check valve" in the fuel system?

heres my problem...

when i go to start my car, i turn the key
it cranks and cranks
i pump the gas and hold it
it starts, sputters, and i have to keep reving it or it will stall
once it finally starts, it runs fine
also, after running i can shut it off and i can start it right up.
but if it sits more than a half hour its hard to start again.

is this the losing fuel pressure problem? i see a lot of post up and it seems pretty common. i am in the process of getting to test fuel pressure so dont yell at me, im just asking questions....
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87 Porsche 924s
00 Honda civic SI

[Paul]

Welcome to the board. Most of what you've read is for a 2 liter 924.

Try replacing your DME relay, there may be a spare in your glove box. Also check for air leaks.
_________________
White 87 924S "Ghost"
Silver 98 986 3.6l 320 HP "Frank N Stein"
White 01 986 "Christine"
Polar Silver 02 996TT. "Turbo"
Owned and repaired 924s since 1977
Porsche: It's not driving, it's therapy.

[924s167]

ok...thanks i will look

and sorry i forgot to say what car.....

87 porsche 924s w/2.5L
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87 Porsche 924s
00 Honda civic SI

[masterdave]

i have the same issue, i found that it was a fuel pressure problem. I am in the middle of replacing the fuel pump now so when i finish the job i will be able to tell you if that was the issue. you dont need a gauge to test for pressure in your case you are looking at an all or none situation in terms of pressure, the simplest thing to do is take the nut at the head of the fuel rod off, run the pump for 30 sec. just turn the key to on not start, you should get a little less than a liter of fuel i think its officially 850cc according to my manual, but if the pump is bad you will notice quickly that the fuel is only dripping out. If that is the case check your fuel lines for leaks as well. replacing the pump and lines can get pricey so its best to find the root of the problem. A new pump and lines will cost around 1500-2000$ and is a difficult job if you dont have a lift or a good set of jack stands and a creeper. However the lines do degrade over time and some times just go bad so it may be a pressure leak in the lines.

best of luck
dave

[moorepower]

Try this: http://www.clarks-garage.com/pdf-manual/fuel-01.pdf

I rigged up a cheap pressure tester by using a foot or so of 3/8" fuel line and a cheap generic fuel pressure gauge. Just push the fuel line over the threaded part of the fuel rail that's exposed when you remove the cap and ball from the end. Secure with a small hose clamp. Attach the other end to the gauge (duh).

There is supposedly a check valve somewhere in or near the fuel pump to keep pressure in the lines.
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Dan.

'88 924S-LE (Luddite Edition)
Manual steering, manual sunroof, manual windows, AC delete, cruise delete, M030 Konis, 25.5mm torsions, 26.8/20 sways

[924s167]

wouldnt you notice fuel leaking on the ground if i had a bad line?
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87 Porsche 924s
00 Honda civic SI

[masterdave]

not always, fuel evaporates fast enough that if there is a small crack in the line the pressure could drive vaporous gas out instead of liquid gas. as well, the lines lines for fuel injection systems are not only rubber, they have a sort of woven cloth inside, the cloth keeps the liquid gas in and the rubber seals it to keep it pressurized. the best way to check is pinch the line with pliers by changing the shape the cracks expose them self and you will see liquid gas build up around them.

[924s167]

ok, i see. thanks for help!
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87 Porsche 924s
00 Honda civic SI