1988 BMW 535i Repair Question
Mileage: 70,000 miles.
I have a 1988 BMW 535si. I am trying to diagnose a problem where the engine will turn over and surge for a second and then die. I believe that it has to do with the fuel pump relay. Problem is that I can’t get a straight answer from the dealer as to wh
The lid on the fuse box identifies the relays on the inside and doesn't mention a fuel pump relay, so i am assuming that the relay I am looking for is one of the 6 relays on the outside of the box.
Thank you for your assistance.
Asked by KenShotwellAnswer
Looking at your pic-the main relay is the 1st on the left corner and the fuel pump relay is above it
Thank you very much. You are an angle!
To rasmataz, In addition to saying thanks, i want you to know that even though i can't return the favor you have so graciously done for me, I will repay your kindness to someone else that i meet along the way and tell them it's because of your kindness helping me. God bless. Ken
Your welcome and thank you for the kind words-your appreciation is good enough and TY for using 2carpros -God Bless
Regarding the 535is question I posted before. Located and tested the relay (thanks to your diagaram) and it tests fine. The fuel pressure holds stead at 38psi and when car dies/turned off, it still holds 38 psi in the rail.
The ground from the relay is open until the car starts and then it closes. When the ground opens the car dies. but the fuel pressure is maintained at 38 psi indicating that there is a closing switch to ground further down stream. This also indicates to me that the fuel system is not an issue and also the fule pump relay is not the culprit either.
What switches the ground from the fule pump relay to the actual ground further down stream? is that the computer, another relay or is it possible that the computer is not grounded properly?
BTW, where is the computer located????
Thanks for your reply.
Ken
Brain box is at under left side of dash-
Could be a ground issue, double check computer ground and also the computer might not be grounding the fuel pump relay to transfer power to the fuel pump