Welcome to Bimmerfest -- The #1 Online Community for BMW related information! Please enjoy the discussion forums below and share your experiences with the 200,000 current, new and past BMW owners. The forums are broken out by car model and into other special interest sections such as BMW European Delivery and a special forum to voice your questions to the many BMW dealers on the site to assist our members!

Please follow the links below to help get you started!

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

Thread Tools Display Modes
Prev Previous Post   Next Post Next
Old 12-29-2012, 10:41 PM
samdayo samdayo is offline
Registered User
Location: CA
Join Date: Aug 2012
Posts: 10
Mein Auto: 2001 E39 Wagon
Question on Fuel Pressure Test / Diagnostic

Having a non-start issue and wanted to ask some general questions as I've looked at a lot of threads and youtube videos but there doesn't seem one to help me answer my questions.

I'm hoping someone who has done a fuel pressure test on an E39 / M54 can confirm a possible bad pump.

Thanks in advance. I'm using the Actron fuel pressure tester cp9220a featured on Bluebee thread on finding the Schrader test valve. By the way, the adapter on my kit did not fit the rail valve well without a slight modification to the brass fitting. It would leak at the adapter because it would not thread all the way down due to the collar on the Schrader value.

Question : I've read the fuel rail is under pressure but when I first installed the tester, it was at 0 psi. Is that the case? Car has been sitting for 1 week due to non start. I'm assuming 0 is normal but I keep reading warnings about it should already be pressurized.

I can hear my fuel pump prime for 2 seconds each time I put key to 'on' position or second position.

Question : Does key to 'on' position increase the fuel pressure up to 48 psi immediately or does it take time to build up? I've watched some youtube videos but everyone likes to cut to the car running state instead of showing you what happens when key to 'on' position.

In my situation, the first time I put key to 'on' position, psi went up to 10 and I watched it climb to a little more in the next 20 seconds. It probably went up to 13-14 psi. My car is currently in a no-start situation and the most I can do is cycle the key to the 'on' position and keep priming my fuel pump. After about 3 or 4 key to 'on' position, the psi is around 40. I had to cycle the fuel pump (2 second priming each time) about 8 times to build up to 45-48 psi. Once I built up the pressure, it holds it.

Question : Is this normal or should it jump up to around 48 psi the first time the fuel pump is primed?

To remove the fuel pressure tester, I had to depressurize the rail by holding a button on the tester and dumping the fuel out. Of course, psi went back to 0.

Thanks for helping me understand the testing better. I appreciate your responses.

By the way, if anyone has a good link to test for spark on an E39 or M54 engine, please send it my way. The best I've found is to remove the coil and spark plug and then ground the spark plug and try starting the car to watch for spark. Any other ways to confirm spark?
Reply With Quote

See More Related BMW Stories

Forum Navigation
Go Back   Bimmerfest - BMW Forums > BMW Model Discussions > 5 Series > E39 (1997 - 2003)
Today's Posts Search
Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On

Forum Jump

All times are GMT -7. The time now is 04:28 AM.

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
© 2001-2015 performanceIX, Inc. All Rights Reserved .: guidelines .:. privacy .:. terms