Member, Sport: On DSC: On (>100 posts)
Join Date: May 2008
Location: North Carolina
Thanked 12 Times in 11 Posts
First, thanks to all for the helpful posts and threads. My frustration with the situation can sometimes leak into posts.
Second, I got back to my car and installed the expensive big black relay in the trunk. Relay works--voltage is now present at the pump--but the pump did not come on. Old relay did not click. New relay does. No surprise. I already ordered a pump and filter and they just arrived. I plan to go back to the car for install tomorrow. Odd that both the relay and pump would fail unless the failed pump somehow also created failure of the relay. In all this the 25A fuel pump fuse is still intact. Makes one wonder if the current rating is best or if a lower current fuse should be used.
A couple of questions:
1. Unfortunately, I have a nearly full tank of fuel (I know a rarity in an E39 M5). How best to siphon it off? How much until it is at the level of the fuel pump cover under the seat--or can I just siphon from there? I seen videos that show siphoning from the fuel pump cover, but am not clear how high the cover for the fuel pump is relative to the tank overall. Looks to be easier to siphon from the fuel pump cover.
2. I want to get the beast home then install the fuel filter--about 23.5 miles from home (I know since I did the 47 mile round trip on my bike expecting to drive the car home after relay install). I think that install could wait until I get home unless there was some really bad gas I got. More than likely the fuel pump failed a normal old age death though (about 135,000 miles)
Last edited by MMMotorsport; 10th July 2019 at 07:39 PM.