secondary fuel pump? - BMW M5 Forum and M6 Forums
E39 M5 and E52 Z8 Discussion 1998-2003 Advertiser's Forum

 2Likes
Reply
 
LinkBack Thread Tools Rate Thread Display Modes
post #1 of 13 Old 27th June 2019, 02:21 AM Thread Starter
felip
Member, Sport: Off DSC: On (>50 posts)
 
felip's Avatar
 
Join Date: Aug 2007
Location: San jose
Posts: 78
Thanks: 1
Thanked 3 Times in 3 Posts
secondary fuel pump?

hey guys and gals,


haven't post in awhile but something has come up with the m5 that has me stumped. the car is starting, but not running i determined that it is a fuel issue, so i went over all the common stuff new fuel pump, new fuel filter, fuses,new fuel pump relay,new senors. then i was told by my shop that it might be the secondary fuel pump that they said is somewhere in the engine bay that is hard to get to. but i seem to not find any images of it or how much it costs.

is there a secondary fuel pump? i searched the forums and cant find anything any help would be appreciated
felip is offline  
Sponsored Links
Advertisement
 
post #2 of 13 Old 27th June 2019, 03:02 AM
josiahg52
M5 Guru (>2000 posts)
 
josiahg52's Avatar
 
Join Date: Nov 2008
Location: New England
Posts: 3,772
Thanks: 1,259
Thanked 762 Times in 621 Posts
No. There is no secondary fuel pump.

2/2001 M5, Jet Black, Exclusive Complete Black Walk Nappa Point Heritage Leather, Black Cubic Trim
8/2011 X5 xDrive35d Sport, Black Sapphire Metallic, Black Nevada Leather, Fine Burr Walnut Trim
josiahg52 is online now  
post #3 of 13 Old 30th June 2019, 06:37 AM
BWM
Addicted Member (>300 posts)
 
Join Date: May 2018
Location: TN
Posts: 340
Thanks: 33
Thanked 37 Times in 33 Posts
I'd also consider looking for another shop. That is a kind a red flag for a shop competence. Not everybody should be working on cars as complex as ours are.

2003 BMW M5 Blue Water Metallic
VDO oil pressure gauge * ZHP weighed shifter * Euro leather armrest * Spal electric fan * Bilstein B6 (stock springs retained) struts and shocks * Supersprint headers, HJS cats, X pipe, Vibrant Performance resonators, Supersprint Magnum mufflers and all new SS T304 Vibrant Performance mandrel bend tubing.

2003 BMW X5 4.6is Saphire Black Metallic
1997 BMW 528iA Alpine White
BWM is offline  
 
post #4 of 13 Old 30th June 2019, 05:44 PM
gsfent
M5 Expert (>4000)
 
gsfent's Avatar
 
Join Date: Feb 2001
Location: west palm beach. fl.
Posts: 12,754
Thanks: 2,306
Thanked 1,621 Times in 1,228 Posts
Quote:
Originally Posted by BWM View Post
I'd also consider looking for another shop. That is a kind a red flag for a shop competence. Not everybody should be working on cars as complex as ours are.
Agreed. Maybe the OP's car is low on blinker fluid???

The only other thing that comes to mind is the siphon pump which transfers fuel from the left side of the fuel tank to the right side, which feeds the engine. But if the OP has more than about 1/2 tank of fuel, that should not be an issue either.

Regards,
Jerry

'01 Black/caramel
Dinan Stage 3 suspension, SS jet coated headers, ESS SC kit w/ 1 range colder NGK's, 92mm pulley, 440 Big Greens, TTFS alpha N tune for meth, RK plenum plates, SBC Endurance Stage 3 Kevlar performance clutch setup, "Jed" lightened DMFW, open brake ducts, TEC cupholder, U.S.(Euro style) tilt/slide armrest, 6k HID fogs, Umnitza bi-xenon flamethrowers w/6k super white low beams, rear fogs, V1/Stealth1, dual head LI, 2.65 diff w/40% lockup/2x dynamic, compact spare, M5 logo trunk carpet, Euro trailer hitch, Mocal oil cooler, ACS type rear spoiler, Rogue custom SSK and tranny mounts, ST 355 BBK (fronts), BP sway bar brackets, Bluetooth retrofit, Speedhut boost gauge (20 psi), Dinan TB's and VS, KB BAP, Howerton/HFS-3 Aquamist WI trunk setup (50/50), with 2nd gauge in rear view mirror, aftermarket trunk mounted sound system integrated into stock unit (amps, crossovers, sub and speakers).......
gsfent is offline  
post #5 of 13 Old 30th June 2019, 10:27 PM
Sailor24
M5 Expert (>4000)
 
Sailor24's Avatar
 
Join Date: Oct 2010
Location: Cobourg Ont
Age: 57
Posts: 9,751
Thanks: 986
Thanked 1,968 Times in 1,652 Posts
I am going to skip the humor of the secondary fuel pump, but I really want to make a joke. So the car starts but fails to run, why do you think it is fuel? Have you unplugged the MAFs electrically? It still may not wan to run because of adaptions but play with the gas and see if you can keep it running for a bit to change adaptions. If it will stay running let it run longer. Basically you want to see if the car runs differently without the air volume signal. Oftem when that signal is wrong it appears that you have a fuel issue but really it is just bad MAFs.
Sailor24 is offline  
post #6 of 13 Old 2nd July 2019, 01:11 AM
TheShafro
M5 Guru (>2000 posts)
 
TheShafro's Avatar
 
Join Date: Aug 2012
Location: Los Angeles
Age: 26
Posts: 2,425
Thanks: 64
Thanked 166 Times in 149 Posts
TheShafro is offline  
post #7 of 13 Old 2nd July 2019, 03:20 AM
RobertDenali
Member
 
Join Date: Sep 2018
Posts: 48
Thanks: 0
Thanked 2 Times in 2 Posts
RobertDenali is online now  
post #8 of 13 Old 2nd July 2019, 10:50 PM
Freude_am_Fahren
Member, Sport: Off DSC: On (>50 posts)
 
Join Date: Sep 2012
Location: The Netherlands
Posts: 86
Thanks: 2
Thanked 18 Times in 12 Posts
Try to start the car a couple of times (of 'normal' length in time), in succession and then pull one of the spark plugs: If it's still dry then the engine is not getting fuel. Then do the MAF-disconnected test as already suggested. I would also verify that the fuel pump is running: Pull the rear seat and remove the cover (on passenger side) that is attached with 3 Phillips screws. Let someone else start the car and check if you can feel (fingertips) or hear (pencil on the circular cover, your ear on the other end of the pencil) any vibration of the fuel pump on the black circular cover. No vibration to be felt/heard could mean a dead fuel pump, or the fuel pump relay is not properly grounded by the engine control unit (DME), which is a problem for your 'matured' indie. A dead fuel pump can sometimes be checked pretty easy: Tapping with a rubber mallet on the cover, sometimes temporary kicks some life into the fuel pump again, but if it does, it means the brushes of the fuel pump are worn. If the spark plug is wet from fuel, than perhaps sparks are absent. Then it's time for the spark plug test.

Spark plug-test
Connect the ignition coil to the wiring again, stick the removed spark plug in the ignition coil and put it on the cylinder head (a bit away from the threaded hole, to prevent the engine from fire-spitting* ...!), so that the outer thread of the spark plug touches the metal of the head. Let someone else start the car, while you check for sparks.

ICV (Idle Control Valve)-test
During the starting attempts, simply play with the gas pedal. If the car now starts, then it indeed is the ICV that is not opening enough (due to carbon deposits) for idle air flow to pass. If not, the causes above are more probable.

*) With a 9th spark plug lying around, you can install the pulled spark plug again and do the spark test with the 9th spark plug. You'll certainly see no fire-spitting then ...

Last edited by Freude_am_Fahren; 3rd July 2019 at 12:12 AM.
Freude_am_Fahren is offline  
post #9 of 13 Old 3rd July 2019, 12:20 AM
Blockdoc
M5 Guru (>2000 posts)
 
Blockdoc's Avatar
 
Join Date: Sep 2004
Location: Santa Barbara, CA
Posts: 2,075
Thanks: 750
Thanked 358 Times in 211 Posts
Quote:
Originally Posted by josiahg52 View Post
No. There is no secondary fuel pump.
While I agree about the lack of knowledge of the S62 at this shop....keep in mind that many of the later models have a secondary (cam driven) high pressure fuel pump in the engine bay just before the fuel rails. Not making excuses for them, but if they weren't listening that closely, it would be an understandable assumption to make.

2003 Sterling Grey M5 SOLD
ESS kit #1 with RK AUTOWERKS Upgrade! (RK/EVO software, Injectors, Fuel Pump)
Dinan Free Flow Exhaust, Dinan Rear Sway Bar
Super Sprint Headers
Rogue Octane SSK and WSR
CNS Racing clutch and flywheel
DICE Ipod connectivity
Bimmian Black Kidney Grilles
AngeliBright V3 6000k LED Upgrade, HID Fogs
Ultimate Pedals
BSW Stage 1 speaker upgrade/BSW Subwoofer
Rear Wheels Up Front (275s all around)
Aquamist HFS3/Howerton Engineering Tank (pre/post SC nozzles)
RK Autowerks CNC Plenum Plates

2015 M4 Coupe DCT (BootMod flash Custom Paul Johnson Tune, downpipes, Methanol 100 percent , E30 map, Pure Turbos 700WHP+, 295/275 tires with Vorsteiner wheels)
2018 Jeep Hellcat Trackhawk (707HP Supercharged)
Blockdoc is offline  
post #10 of 13 Old 3rd July 2019, 07:18 PM
Freude_am_Fahren
Member, Sport: Off DSC: On (>50 posts)
 
Join Date: Sep 2012
Location: The Netherlands
Posts: 86
Thanks: 2
Thanked 18 Times in 12 Posts
Quote:
Originally Posted by Blockdoc View Post
...keep in mind that many of the later models have a secondary (cam driven) high pressure fuel pump in the engine bay just before the fuel rails. Not making excuses for them, but if they weren't listening that closely, it would be an understandable assumption to make.
No high pressure fuel pump on the engine/ in the engine bay of the S62B50. It is only present on diesel engines like:
E39 type ------------ Engine type -- HP-fuel pump BMW-no.
E39 520d ----------- M47 ---------- 13517787532
E39 525td or 525tds M51 ---------- 13512244966
E39 525d or 530d -- M57 ---------- 13517787632

The S62B50 engine however does have several other pumps in the engine bay. Maybe you meant one of these:
Lubrication system oil pump
Lubrication system compressor
Air pump for vacuum control
Emission control air pump

Last edited by Freude_am_Fahren; 3rd July 2019 at 09:48 PM.
Freude_am_Fahren is offline  
Reply

Bookmarks

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the BMW M5 Forum and M6 Forums forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in











Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes Rate This Thread
Linear Mode Linear Mode
Rate This Thread:



Posting Rules  
You may post new threads
You may 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
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome