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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 10-01-2011, 01:03 PM
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redbull713 redbull713 is offline
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Mein Auto: '97 540i/6
How do I tet fuel pressure on 540i m62 V8?

I know on the inline 6 there is a shrader valve but not on the v8. So how do I test? I heard that I can rent an adapter or something from autozone, does anyone have any info?
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  #2  
Old 10-01-2011, 01:20 PM
JimLev JimLev is offline
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Mein Auto: 540/6, S60 Volvo, Tribeca
The newer V8's do have a schrader valve. You need a gauge that you can Tee into the fuel line.
Are you having problems? If so and you have never changed your fuel filter I'd change it.
Your fuel pressure at idle should be about 52 PSI.
Leave the gauge connected and turn the engine off. The pressure shouldn't drop more than 7 PSI in ~20min.
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  #3  
Old 10-01-2011, 01:24 PM
edjack edjack is offline
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Jim, he doesn't have a "newer" car.

I've not investigated the AutoZone device, but it needs to have the proper quick couplers to connect into the fuel line. Go ask them.

Harbor freight has a deluxe kit that seems to have the requisite fittings. As I recall, the kit is $130.
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  #4  
Old 10-01-2011, 01:30 PM
JimLev JimLev is offline
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Mein Auto: 540/6, S60 Volvo, Tribeca
ed, right. I was just mentioning it for the ones that have a 9-98 or newer cars. At least I think that's when they started putting them on the fuel rail.
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  #5  
Old 10-01-2011, 04:54 PM
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bluebee bluebee is offline
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Mein Auto: 02 BMW 525i M54 auto 130K
Quote:
Originally Posted by JimLev View Post
The newer V8's do have a schrader valve.
What about the 2002 525i?

Do "I" have the schrader valve on my M54 engine fuel system?

Quote:
Originally Posted by JimLev View Post
Your fuel pressure at idle should be about 52 PSI.
Is that for the V8 or for the I6?

How would a 'clogged' fuel filter affect the fuel pressure?

Quote:
Originally Posted by JimLev View Post
Leave the gauge connected and turn the engine off. The pressure shouldn't drop more than 7 PSI in ~20min.
What does it mean if the pressure 'did' drop more than 7 psi?

Would that mean:
a) A leak?
b) A clogged fuel filter?
c) A worn out fuel pump?

Quote:
Originally Posted by edjack View Post
I've not investigated the AutoZone device, but it needs to have the proper quick couplers to connect into the fuel line. Go ask them.
I called the Autozone in San Jose California on 2690 Story Road (408-254-4865) to ask.

They have an all-inclusive fuel pressure testing kit, P/N CP99208, which they'll lend to you for a deposit of $150 (which you get back when you return the kit within 90 days).

Quote:
Originally Posted by edjack View Post
Harbor freight has a deluxe kit that seems to have the requisite fittings. As I recall, the kit is $130.
Since the Autozone kit is free (in effect), that's the way to go for one-shot fuel pressure testing for me.

However, this quest is moot if the M54 doesn't have the schrader valve.

Unfortunately, I can't find the CP 99208 by googling (wrong number?).

Can someone confirm that the 2002 M54 is 'testable' by a 'standard' Autozone $150 deposit fuel pressure test kit free loaner?

Last edited by bluebee; 10-05-2011 at 08:23 PM.
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  #6  
Old 10-01-2011, 05:16 PM
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bluebee bluebee is offline
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Mein Auto: 02 BMW 525i M54 auto 130K
Quote:
Originally Posted by bluebee View Post
Unfortunately, I can't find the CP 99208 by googling (wrong number?).
I called a few more Autozones.

The $150 Autozone loaner is an Actron CP 9220A, "Fuel Pump Diagnostic Kit".

Quote:
Actron's Fuel Pump Diagnostic Kit, No.CP9220A, is designed to help detect whether a fuel pump is defective and to assist in diagnosing fuel-system related performance problems. This kit features a 40" gauge hose to easily reach any test point. The kit is compatible with vehicles that have a Schrader valve test port on the fuel rail; a detachable rubber hose connection at fuel rail, fuel line or fuel filter; are GM models with threaded connection at fuel filter or throttle body; or are Asian, European and domestic makes with a "banjo bolt" connection.
Does this (Autozone free loaner) kit look like it will work on a BMW 2002 525i?
- Actron_fuel_pump_diagnostic_kit, for accurate_detection_of_defective_fuel_pumps

I called Actron at (800) 228-7667, but nobody answered on a Saturday.
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  #7  
Old 10-11-2011, 09:18 AM
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bluebee bluebee is offline
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Mein Auto: 02 BMW 525i M54 auto 130K
To locate the M54 engine fuel system Schrader valve, I opened a separate thread ...
- Where is the M54 fuel line schrader valve (to test lean condition fuel pressure)?

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  #8  
Old 10-11-2011, 10:47 AM
edjack edjack is offline
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Mein Auto: '97 540i 6 speed
This one looks like it would fit: http://www.harborfreight.com/master-...kit-97706.html
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