Have Mercedes Questions? Ask a Mechanic for Answers ASAP
Hi, welcome to Just Answer. I’m Ron and I’ll be helping youtoday.Before we get started though, Please understand that I don't knowyour skill level or tools you have to assist us. Also understand thatI can't see, smell, hear, or touch the vehicle either, so patience isappreciated. JA is a great Q/A site, but it does NOT replace arepair shop.My goal is to make you happy and get a great rating in return formy time. Sometimes I have to give you bad news that I know youdidn’t want to hear, so please don’t shoot the messenger.
Okay, no problem. We do need to check the fuel pressure with a gauge as well as check for spark at the plugs with a spark tester to see what we are missing. keep me posted of your results.
Okay, then check to see if we have power to the pump. Check fuses first, then power at the pump. If we have power, then the pump is bad.
Thanks again and please remember to rate me 5 stars and keep this link in case you need me again later on.
The power is only continuous for a couple of seconds when you turn on the key then it stops. It appears to be working right then. Sounds like you do have a bad pump.
Sure, the engine isn't running, that's why.
It will stay on when the engine is running, but if the pump is bad, how cam it stay running?
Thanks again and please remember to rate me my 5 stars and keep this link in case you need me again later on.
Just following up to see if you had any more questions.