Fuel Pump Preventive Maintenance? - Page 3 - BMW M5 Forum and M6 Forums
E39 M5 and E52 Z8 Discussion 1998-2003 Advertiser's Forum

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post #21 of 24 Old 10th July 2019, 07:39 PM Thread Starter
MMMotorsport
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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)


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Last edited by MMMotorsport; 10th July 2019 at 07:39 PM.
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post #22 of 24 Old 10th July 2019, 08:53 PM
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The relay should not click! It is solid state, no moving parts. Do yourself a favor and use that thread I linked you to.
Yes good idea to wait to put the filter in, unless it is totally plug but I doubt that. You should always run a pump for a bit into the old filter so any debris moves to the filter, then change it out, no sense making your new filter dirty seconds after install.

Last edited by Sailor24; 10th July 2019 at 08:56 PM.
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post #23 of 24 Old 10th July 2019, 09:25 PM Thread Starter
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Sailor,
According to the thread you provided it SHOULD click. Look at the first post towards the end of step 3:

https://www.m5board.com/vbulletin/e3...pper-wire.html


That is how the relay transfers the low current signal circuit to the higher current supply circuit.
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post #24 of 24 Old 11th July 2019, 02:08 AM
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Considering his was in fact dead how would he know? It was discussed later in the thread.... Wading through misinformation is a feat unto itself. Reading any thread through to completion is important in any forum. Never heard one click, never felt one click, although you can feel something, but it is not a click. There are several threads here where we pulled them apart and showed how they work, no click. There are other relays beside it that might click and confuse you, but there is nothing in the big black on to go click.
Although a normal relay is an electro magnetic switch, this device is not that at all.
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