Hi guys. I’ve got a c180 1998. 2 or 3 days of the week the fuel pump won’t work when I turn the key to position 2 (no sound at all and when i try to start it, it won’t) and I am forced to turn on the car using LPG. The other days it works so well that I can’t tell it even has an issue. What could be the issue? Bad fuel pump? Bad relay? Thanks

 

if you have access to the electrical diagram for the fuel pump starting system check everything in the system