Fuel pressure issue?
Thread Starter
Super Member
Joined: Dec 2005
Posts: 806
Likes: 27
From: Rochester, NY
2009 S550 AMG sport pckg. 2014 Ford F-150 Lariat Supercrewcab
Fuel pressure issue?
Hey everyone,
My 09 s550 has been running alittle rough lately amd it takes a bit to first start up in the morning. After it warms up it runs much better. I am suspesctng fuel system. Did a fuel pressure/leak down test and my findings were:
A) fuel pressure went to 45psi from a cold prime w/o engine running
B) fuel pressure leaked down to 30 psi in 10 minutes
C) pressure bounced betweem 55-60 psi. W/ engine running
Any thoughts? Maybe fuel injectors or fuel pump check valve?
My 09 s550 has been running alittle rough lately amd it takes a bit to first start up in the morning. After it warms up it runs much better. I am suspesctng fuel system. Did a fuel pressure/leak down test and my findings were:
A) fuel pressure went to 45psi from a cold prime w/o engine running
B) fuel pressure leaked down to 30 psi in 10 minutes
C) pressure bounced betweem 55-60 psi. W/ engine running
Any thoughts? Maybe fuel injectors or fuel pump check valve?
Thread Starter
Super Member
Joined: Dec 2005
Posts: 806
Likes: 27
From: Rochester, NY
2009 S550 AMG sport pckg. 2014 Ford F-150 Lariat Supercrewcab
09 mercedes S550 fuel pressure test engine running:
Heres a video of the fuel pressure at idle. Seems pretty erratic to me
Heres a video of the fuel pressure at idle. Seems pretty erratic to me
