2012 e550 fuel pump relay keeps popping. PLEASE HELP
Thread Starter
Newbie
Joined: May 2023
Posts: 12
Likes: 1
2004 g500
2012 e550 fuel pump relay keeps popping. PLEASE HELP
My fuel pump relay keeps popping. Even if the ignition switch is off and I replace it. Pops as soon as it is inserted. What could cause this issue other than fuel pump? Thank you
Thread Starter
Newbie
Joined: May 2023
Posts: 12
Likes: 1
2004 g500
I did that. Also I have taken the rear seat out and disconnected the fuel pump electrical and it still blew. I disconnected the fuel filter and it still blew. I then found and disconnected the fuel pump control module and it didn’t blow. I think this may be the problem. Has anyone else had this issue?
MBWorld Fanatic!
Joined: Jan 2014
Posts: 3,966
Likes: 1,315
From: Republic of Texas
'99 and '05 E55 AMG
With a multimeter, see if the power line (fuse or relay pulled at source and unplugged from module) is shorted to chassis ground. If not, and fuse blows when module is connected to power, you have your answer. Replace module.
I just went through this drill to locate a shorted door control module that was killing the interior CANBUS.
I just went through this drill to locate a shorted door control module that was killing the interior CANBUS.
MBWorld Fanatic!
Joined: Jan 2014
Posts: 3,966
Likes: 1,315
From: Republic of Texas
'99 and '05 E55 AMG
I "think" you can swap the module directly. Be advised I'm not taking the time to dig into the WIS (Workshop Information System) I have as it turns into a rabbit hole; I start reading and don't stop for hours...
The following applies generally to the vehicles with which I am familiar which are the '99 to '09 MB sedans and such. In general, the only modules to be programmed to the car are considered theft-relevant and require the VIN to input into the module. The VIN can be modified later but it takes the developer kit and technical knowledge to do so. These items are usually the EIS (ignition switch), ME-SFI (motor electronics), keyfobs, steering lock module, and instrument cluster. The ESM (electronic shift module) requires initialization on the first install but can be transferred to another vehicle later without issue. If you were to obtain a rebuilt/virginized motor electronics module, that module must be mated to the car using STAR/Xentry or equivalent. I've done one of those as a favor; I was a bit nervous first time but it actually went smoothly and quickly without any issues.
Later model years Mercedes coded many more modules as theft-relevant such as the instrument cluster clock(!). To me, seems like a way to force owners to the dealer and not aftermarket.
The following applies generally to the vehicles with which I am familiar which are the '99 to '09 MB sedans and such. In general, the only modules to be programmed to the car are considered theft-relevant and require the VIN to input into the module. The VIN can be modified later but it takes the developer kit and technical knowledge to do so. These items are usually the EIS (ignition switch), ME-SFI (motor electronics), keyfobs, steering lock module, and instrument cluster. The ESM (electronic shift module) requires initialization on the first install but can be transferred to another vehicle later without issue. If you were to obtain a rebuilt/virginized motor electronics module, that module must be mated to the car using STAR/Xentry or equivalent. I've done one of those as a favor; I was a bit nervous first time but it actually went smoothly and quickly without any issues.
Later model years Mercedes coded many more modules as theft-relevant such as the instrument cluster clock(!). To me, seems like a way to force owners to the dealer and not aftermarket.
Trending Topics
MB World Stories
The Best of Mercedes & AMG
Manual Mercedes? 6 Times Sindelfingen Let Drivers Have All The Fun
Verdad Gallardo
Mercedes SLR McLaren 722 S Is Extremely Rare Example Modified by McLaren
Verdad Gallardo
8 Classic Boxy Mercedes Designs That Have Aged Like Fine Wine
Verdad Gallardo
Flawlessly Restored Mercedes 190E Evo II Heads to Auction
Verdad Gallardo
Electric Mercedes C-Class Unveiled: 11 Things You Need to Know
Verdad Gallardo
Mercedes EQS Gets A Major Update: Everything You Need to Know
Verdad Gallardo
5 Underrated Mercedes-Benz Models That Don't Get the Love They Deserve
Verdad Gallardo
Mercedes 300D Has Pushed Well Past 1 Million Miles and It Ain't Stopping
Verdad Gallardo
