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Main/Fuel Pump relays

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  • Crank
    replied
    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!

    Leave a comment:


  • Split_S
    replied
    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.

    Leave a comment:


  • mwagner10702
    replied
    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    Drivers Side (Fuel Pump Relay) 61-36-1-378-238 (superseded to: 61-36-8-373-700)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!

    Leave a comment:


  • Chris W
    replied
    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.

    Leave a comment:


  • Crank
    replied
    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!!!

    Leave a comment:


  • mwagner10702
    replied
    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.

    Leave a comment:


  • Crank
    replied
    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.

    Leave a comment:


  • mwagner10702
    replied
    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

    Leave a comment:


  • Crank
    replied
    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.

    Leave a comment:


  • D///M3
    replied
    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

    Leave a comment:


  • ShiftBMW
    replied
    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.

    Leave a comment:


  • D///M3
    replied
    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".

    Leave a comment:


  • BeastPower
    replied
    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.

    Leave a comment:


  • ShiftBMW
    started a topic Main/Fuel Pump relays

    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.
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