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7 Series - E38 (1995 - 2001)

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  #1  
Old 01-26-2013, 11:27 AM
squabe squabe is offline
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Location: cali
 
Join Date: Jan 2013
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Mein Auto: 740 e38
Loses fuel pressure when parked

hello bimmerfest i am new to the board but have used many tips from the board. I would appreciate any suggestions. I have a 97 e38 with m62 motor I recently changed fuel filter and two weeks later my car would lose fuel pressure after sitting for 5 minutes or so. I went under the car and noticed while the car was running the fuel line had plenty of pressure soon as i turn the motor off withing 5 minutes it would lose pressure. Trying to fix this i have changed the fuel pressure check valve in the tank, the regulator and fuel pump. After car cranks for a while it starts and runs perfect! I have noticed no gas smell coming from from the lines or around the car. Please help. Car has 250,000 and runs great!
i have also changed osv, cooling pipes, intake man gaskets, and crank position sensor.
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  #2  
Old 01-27-2013, 02:37 AM
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BMWFatherFigure BMWFatherFigure is offline
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Location: Perth, Western Australia
 
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Mein Auto: E23;E30;E38;E32;E34 +
Try clamping the rubber parts of the fuel supply pipe and fule return pipe, one at a time. That will tell you which way the pressure is being lost. If neither make any difference (ie you still get a loss) it points to leaking injectors or an external (pipe) leak. Not much fuel needs to leak to reduce the pressure. Also join in a gauge if possible to watch the pressure go down.
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  #3  
Old 01-27-2013, 04:41 PM
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joyism5 joyism5 is offline
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After checking the above mentioned I would check if the fuel injectors are leaking. Order some new o-rings, remove them and check you tube for tutorials how to check them and clean them also. There are a lot of videos. If you want to find which one is leaking you could check the spark plugs for deposits.
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Old 01-27-2013, 11:24 PM
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BMWFatherFigure BMWFatherFigure is offline
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Mein Auto: E23;E30;E38;E32;E34 +
If you suspect leaking injectors get them rig cleaned and tested. Bit $ but the results are
__________________
Good - Fast - Cheap: Pick any two.
Current:
E23 735i; E32 735iL (X 2 - 1 Alpine White and 1 Glacier Blue); E34 535i; E38 735iL; R50 Cooper; R55 Cooper Clubman.
Previous:
E21 318i; E30 318i; E32 735iL; E34 535i; E38 730iL; E53 4.4i
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Old 01-28-2013, 06:16 AM
squabe squabe is offline
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Location: cali
 
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Mein Auto: 740 e38
Thanks guys for your reply. I am going to clamp and check fuel lines. If injectors were leaking would I smell fuel? I have recently changed injectors but had this problem before hand.
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