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Go Back   Bimmerfest - BMW Forums > BMW Model Discussions > 5 Series > E39 (1997 - 2003)

E39 (1997 - 2003)
The BMW 5-Series (E39 chassis) was introduced in the United States as a 1997 model year car and lasted until the 2004 when the E60 chassis was released. The United States saw several variations including the 525i, 528i, 530i and 540i. -- View the E39 Wiki

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  #1  
Old 01-15-2013, 03:48 PM
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Topaz540i Topaz540i is offline
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Location: Hillsborogh, NJ
 
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Mein Auto: 2001 540i/6
how to test fuel pressure properly?

spaghettidecoder is down and i cant find the bentley on my comp....

what is the proper procedure to test the fuel pump?

i assume the pressure is taken at the fuel rail from the schrader valve but does the car need to be idling, driving, under load w.o.t.?

and what is the accepted value? about 50psi in all situations?
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  #2  
Old 01-15-2013, 05:15 PM
JimLev JimLev is offline
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Join Date: Dec 2003
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Mein Auto: 540/6, S60 Volvo, Tribeca
At idle it should be ~ 52 PSI +/- 2 PSI.
I got your PM's last week, wasn't ignoring you, been re-doing my network and building a new computer.
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  #3  
Old 01-15-2013, 05:38 PM
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Topaz540i Topaz540i is offline
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w/e man, ive been bizzy too.

shopping my new system! Ballin on a budget....

infintity basslink powered 10" on the way. Kicker component 5.2's and zx350.4 up next!



so should it stay constant while driving? im wondering if i get bad pressure when im pushing it hard at higher rpms.
__________________
ESS Tuning m60 version software
m60 intake manifold
a.f.e. c.a.i.
3" obx catback
full powerflex urethane setup
545 ssk
cdv delete
m5 rear sway bar
M5 chassis rods
M5 3.15 lsd
Bc-r coilovers w/ swift springs
Akebono=suck
ss braided brake lines

coming soon:

Jb lwfw


Last edited by Topaz540i; 01-15-2013 at 05:40 PM.
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  #4  
Old 01-15-2013, 05:44 PM
JimLev JimLev is offline
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Mein Auto: 540/6, S60 Volvo, Tribeca
The pressure will only vary a few psi from idle to balls to the wall.
At a constant speed/load the pressure should stay the same.
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  #5  
Old 01-15-2013, 05:51 PM
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Topaz540i Topaz540i is offline
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Location: Hillsborogh, NJ
 
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Mein Auto: 2001 540i/6
ok thx. all i could find were people asking the same question but never getting an answer.

I found some old threads about long cranking that got me spooked.

basic sympton is the car turns over a few times before firing but,,,,,,,,,, if you leave the key in pos2 for 5 seconds before igniting it will fire up instantly.

my usual habit is to put the key in and buckle up while i wait for the wheel to lower then fire it up but i do know it takes longer to start if i just shove the key in and twist it.
__________________
ESS Tuning m60 version software
m60 intake manifold
a.f.e. c.a.i.
3" obx catback
full powerflex urethane setup
545 ssk
cdv delete
m5 rear sway bar
M5 chassis rods
M5 3.15 lsd
Bc-r coilovers w/ swift springs
Akebono=suck
ss braided brake lines

coming soon:

Jb lwfw

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  #6  
Old 01-15-2013, 07:38 PM
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bluebee bluebee is offline
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Location: San Jose, California
 
Join Date: Mar 2008
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Mein Auto: 02 BMW 525i M54 auto 130K
Cross referencing to here in case people need the location of the test points:
- While replacing your spark plugs (1), where is the fuel system pressure test Schrader valve for the I6 (1) and for the V8 (1) (2) (3)
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Your job, in return, is to read the suggested threads, where the best people will always add value to those threads, either by pictures or by descriptions, so the next person with the same problem stands on your shoulders.
See also: E39 Bestlinks & How to easily find what you need
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