Fuel issue
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Junior Member
Joined: Jan 2019
Posts: 16
Likes: 7
2007 S550 W221.
Fuel issue
Been awhile guys because i can usually find my answers searching. Not yet for this one.
Fuel pump not getting power but, unlike other threads, my relay tests good and I pulled the pump and hit it with 12 volts and it runs strong. Tester says drive authorizations are all off?!? Actually sprayed some MAF cleaner on the sensor (without removing it …please dont assassinate me. Lol.). Fired right up…until the cleaner was gone. Brand new battery installed yesterday. Any ideas? I also jumped the relay to open and no go. Tried it with the pump out and plugged into the harness. No power. Checked EVERY FUSE IN THE CAR…..including in the power control module( because i have to run a jumper from negative post on battery to yellow and red charging wire for the starter battery…. but thats another thread!) EVERY FUSE GOOD. Slamming forehead mode. Any help appreciated!
Fuel pump not getting power but, unlike other threads, my relay tests good and I pulled the pump and hit it with 12 volts and it runs strong. Tester says drive authorizations are all off?!? Actually sprayed some MAF cleaner on the sensor (without removing it …please dont assassinate me. Lol.). Fired right up…until the cleaner was gone. Brand new battery installed yesterday. Any ideas? I also jumped the relay to open and no go. Tried it with the pump out and plugged into the harness. No power. Checked EVERY FUSE IN THE CAR…..including in the power control module( because i have to run a jumper from negative post on battery to yellow and red charging wire for the starter battery…. but thats another thread!) EVERY FUSE GOOD. Slamming forehead mode. Any help appreciated!
Last edited by David Alan; Feb 6, 2022 at 10:45 PM.
