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  • Main/Fuel Pump relays

    Do you guys replace these as preventative maintenance items? Or at least keep spares in your car? It seems that a lot of them go bad after a while.

  • #2
    It is all about how much you want to spend. On a 20 year old car, most components could do with a refreshing. On my list of priorities, these relays are probably half way down the list, unless they are faulty.

    Cheers, Daniel.
    - 1987 M3 (e30)
    -- BeastPower Motorsports: www.beastpower.com
    - -Eisenmann Exhaust Systems: www.eisenmann.us

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    • #3
      Absolutely.... After getting my car "ready" for a 2600 mile trek to Texas for O'Fest- these were on the list of "PM parts" to be replaced as mine were originals.

      The new relays are in-expensive & well worth the "extra" piece of mind. I keep the old relays in the car "just in case".

      Don McAdams
      1988 E30 M3
      "E30 M3 Owner & Enthusiast"

      www.McAdamsAutoSport.com

      Comment


      • #4
        Inexpensive!?! I got quoted 40 bucks each! :(

        I would have figured 10 bucks or less per relay. Am I looking in the wrong place?

        Also, does anyone have part #'s on these? I was unable to determine which relays they were from RealOEM.

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        • #5
          Relay's Behind Coolant Expansion Tank:

          Relay Location/ Use-Function/ Part #/ List Price:
          • Passengers Side (Evaporative Purge Valve Relay) 13-90-1-311-772 $38.85
          • Middle (Main Relay) 12-63-1-279-004 $22.55
          • Drivers Side (Fuel Pump Relay) 61-36-1-378-238 {superceded to: 61-36-8-373-700} $10.20
          Don McAdams
          1988 E30 M3
          "E30 M3 Owner & Enthusiast"

          www.McAdamsAutoSport.com

          Comment


          • #6
            Originally posted by D///M3 View Post
            Relay's Behind Coolant Expansion Tank:

            Relay Location/ Use-Function/ Part #/ List Price:
            • Passengers Side (Evaporative Purge Valve Relay) 13-90-1-311-772 $38.85
            • Middle (Main Relay) 12-63-1-279-004 $22.55
            • Drivers Side (Fuel Pump Relay) 61-36-1-378-238 {superceded to: 61-36-8-373-700} $10.20


            Can anyone post a definitive set of modern part #’s for these three relays?

            For example, the part # for the passengers side relay in this post does not come up when I Google it.

            I pulled the old blue relay (passenger side) out of my car, turns out it has a manufacturing date of 6/86 on it....... !!!!!

            And, that part number is NLA - 61311373916.

            Then I pulled the orange driver’s side relay out of the car (manufactured 18/87), and that part number is NLA too - 61311375474.



            So what I want to do is buy 3 brand new relays, and replace them.

            Would appreciate the 3 correct modern part #’s, if anyone can share them.

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            • #7
              Pelican shows 61361378238 as available

              https://www.pelicanparts.com/More_In...-1-378-238-M14

              I was also able to find the following on eBay.

              61311373916
              61311375474
              1990 M3

              Usually it's best not to know how much money you have into your M3

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              • #8
                Originally posted by mwagner10702 View Post
                Pelican shows 61361378238 as available

                https://www.pelicanparts.com/More_In...-1-378-238-M14

                I was also able to find the following on eBay.

                61311373916
                61311375474
                Sure, I can dig around on eBay for NOS or used ones. But I’m hoping there are some modern part #’s that I can use to buy brand new stuff.

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                • #9
                  Doubtful you will find any. Here is an example - post #5 explains it.

                  https://s14net.vbulletin.net/forum/s...ge-valve-relay

                  Granted it is just one example but many of these relays were application specific. Some were used in BMW's motorcycle line, but like the automotive examples are NLA.

                  I think your best bet at this point is NOS.
                  1990 M3

                  Usually it's best not to know how much money you have into your M3

                  Comment


                  • #10
                    Originally posted by mwagner10702 View Post
                    Doubtful you will find any. Here is an example - post #5 explains it.

                    https://s14net.vbulletin.net/forum/s...ge-valve-relay

                    Granted it is just one example but many of these relays were application specific. Some were used in BMW's motorcycle line, but like the automotive examples are NLA.

                    I think your best bet at this point is NOS.
                    Fair enough. I appreciate the effort, thank you!!!

                    Comment


                    • #11
                      There's nothing special about the fuel pump relay or the main relay. When buying a relay just compare the electrical diagram on the side of the relay and match the circuit and the pin orientation. You can actually use a 5 pin relay for the fuel pump, and you can also use a spare main relay for the fuel pump. The socket has a slot for the 5th pin. There just isn't a wire connected to it so that circuit simply isn't used.

                      Pelican has several that will work. https://www.pelicanparts.com/catalog...pg5.htm#item21 I bought the Vemo multi-purpose 5-prong relay and it fit for both the fuel pump and main relays.

                      The evaporator purge valve relay on the other hand was a bit unique. The original relay that came with the car was purple, and it wasn't anything special. However, it also caused my car to diesel when I tried to turn off the engine. Years ago when the car was still a supported used car BMW issued a service bulletin for an updated relay to solve the problem. That relay also has a square base like the other relays, but is taller and black. As I understand it, it keeps the purge valve closed for a few seconds after switching off to make sure fuel vapor from the canister isn't drawn into the engine as it switches off causing the dieseling problem.

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                      • #12
                        This whole relay thing has me confused, but here is what is in my car (1990).

                        Click image for larger version

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                        From a previous post:

                        Relays Behind Coolant Expansion Tank:

                        Relay Location/ Use-Function/ Part #/ List Price:
                        Passengers Side (Evaporative Purge Valve Relay) 13-90-1-311-772
                        Middle (Main Relay) 12-63-1-279-004
                        Drivers Side (Fuel Pump Relay) 61-36-1-378-238 (superseded to: 61-36-8-373-700)


                        I can confirm the Evap Purge Valve Relay P/N as correct. We know this relay to be NLA.

                        If in fact the center relay is the MAIN RELAY my car shows a different relay P/N (0332014135) which is still available. My car runs perfectly so I am assuming this is a correct main relay P/N. The P/N listed in the previous post (12-63-1-279-004) is still available. I am hesitant to pull my relay to compare as I don't want to "F" anything up.

                        Which brings us to the Orange Fuel Pump Relay (61-36-1-378-238). I have a spare one as well as the part that supposedly supersedes it (61-36-8-373-700). They are slightly different both in color and number of prongs. The picture below will illustrate. The orange relay (on the right) has 4 prongs while the green relay on the left has 5 prongs. The extra (middle) prong is lshown as 87 on the side of the relay.

                        Click image for larger version

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                        I consulted my Bentley manual but it was useless. Use this information as you may. I will put all these in a box and keep them in my car. Hopefully I'll never have to use them!
                        1990 M3

                        Usually it's best not to know how much money you have into your M3

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                        • #13
                          I changed these a few years ago and when you order from BMW you will get the green relay. You can break off the middle prong if you want - doesn’t matter cause it works either way.

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                          • #14
                            I was able to dig up a new old stock blue relay, and then bought a new orange and a new white (replacement for silver) one. Swapped right in, and the car fired right up.

                            I noticed my old blue one had a lot of corrosion on it, around the bases of the pins. I did previously have a slight battery drain, so I wonder if that was part of it.

                            Anyway... great thread! Thank you!

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