318ti.org forum

Go Back   318ti.org forum > Technical, Maintenance and Modifications > Maintenance

Notices

Maintenance Service Interval questions, oil change info.

.
» Recent Threads
Manual Adjustment of...
09-20-2018 09:05 AM
Last post by John Firestone
Today 08:42 AM
3 Replies, 307 Views
Happy Birthday black98,...
Today 05:00 AM
Last post by 1996 328ti
Today 05:00 AM
0 Replies, 37 Views
FS: 1998 Black BMW 318ti...
10-29-2016 06:52 AM
Last post by port
Yesterday 09:18 PM
10 Replies, 8,102 Views
1996 318ti Part Out
09-13-2018 07:43 PM
Last post by Estii
09-21-2018 10:32 PM
6 Replies, 939 Views
The 318ti OBD-II engine...
10-19-2006 06:48 PM
Last post by HeelAndToe85
09-21-2018 07:53 PM
118 Replies, 76,161 Views
OEM roof spoiler
06-14-2018 12:19 AM
Last post by sortasorted
09-21-2018 06:54 AM
11 Replies, 2,457 Views
Happy Birthday Berni
09-20-2018 05:00 AM
Last post by 1996 328ti
09-20-2018 05:00 AM
0 Replies, 222 Views
M52 Swap Questions
07-01-2018 05:06 PM
Last post by Projectvoltron
09-20-2018 03:59 AM
18 Replies, 2,779 Views
New 318ti Member-...
09-10-2018 11:01 PM
Last post by paul somlo
09-19-2018 06:46 PM
4 Replies, 553 Views
96 - 5 Speed - Green -...
08-01-2018 06:52 PM
Last post by batmite
09-19-2018 09:28 AM
2 Replies, 943 Views
Reply Share/Bookmark
 
Thread Tools Display Modes
Old 05-14-2017, 12:10 AM   #1
mnguyen84
Junior Member
 
Join Date: Apr 2017
Location: United States
Posts: 28
iTrader: (0)
Default Fuel Pressure specs?

According to Bentley, my fuel pressure should be around 40+ psi.

I installed an aftermarket fuel pump recently (Dephi). With the fuel pressure regulator vacuum hosed connected, it only yields 30psi.

Without the fuel pressure regulator hose, it yields 40psi.

Is this normal? Or is the fuel pump out of spec?
mnguyen84 is offline   Reply With Quote
Old 03-21-2018, 10:28 PM   #2
Momo.m44
Junior Member
 
Join Date: Mar 2018
Location: Roswell, GA
Posts: 2
iTrader: (0)
Default

I'd think it's unlikely for the pump to be bad. Have you tested the regular by applying and removing vacuum via hand bleeder?

EDIT: I just tested mine and I'm getting similar results. I get 35 psi regulator on, 45 regulator off. I'm having hesitation problems though. I'm changing the O2 sensors today because these M44 engines are very finicky.

Last edited by Momo.m44; 03-21-2018 at 10:36 PM.
Momo.m44 is offline   Reply With Quote
Old 03-22-2018, 03:51 PM   #3
apexspeedtech
Member
 
Join Date: Sep 2017
Location: Los Angeles
Posts: 40
iTrader: (0)
Default

Spec should be 3 bar - 43.5psi, with the vacuum line off. With the line connected, the regulator should decrease by manifold pressure. If its not making this pressure, it can be the regulator, pump or filter issue.

So if its at spec with the line disconnected, re-connect the line with a T-fitting to a vacuum gauge and the engine running. The fuel if the gauge reads 10psi vacuum, the fuel pressure should be 33.5psi. If not, the regulator is bad.

Last edited by apexspeedtech; 03-22-2018 at 03:54 PM.
apexspeedtech is offline   Reply With Quote
Old 03-22-2018, 04:17 PM   #4
Momo.m44
Junior Member
 
Join Date: Mar 2018
Location: Roswell, GA
Posts: 2
iTrader: (0)
Default

I noticed that in the Haynes manual for e36. The car was off in the test so the regulator didn't change anything. So my fuel pressure is good, but I might have flow issues or intake leak or bad sensors.
Momo.m44 is offline   Reply With Quote
Reply

Bookmarks


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
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 Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
external fuel pressure regulator-M44 fuel rail 9G3Series US and North America 0 04-05-2011 05:23 PM
Help with dasc fuel pressure krovax Induction 13 08-04-2007 03:04 PM
fuel pressure regulator question r1shaun Engine 1 10-15-2006 06:24 PM
fuel pressure regulator mightymax Engine 17 01-11-2006 03:35 AM
Fuel pressure gauge on fuel rail? DustenT Engine 3 12-15-2005 06:43 PM


All times are GMT +1. The time now is 09:08 AM.


.
Powered by site supporters
vBulletin Version 3.8.8
Copyright ©2000 - 2018, Jelsoft Enterprises Ltd.
Copyright ©1999 - 2018, 318ti.org
© vBadvanced CMPS v3.2.2
[page compression: 74.29 k/86.75 k (14.37%)]

318ti.org does not warrant or assume any legal liability or responsibility for the accuracy, completeness, or usefulness of any information or products discussed.