318is eating fuel pumps

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  • ForceBangBlow
    Member
    • Jun 2008
    • 61
    #1

    318is eating fuel pumps

    I searched around on here and other forums/google couldnt find anything.

    Last week my fuel pump died, which I didnt think much of it cause the car has 218k on it and i dunno when the last one has been replaced. And I was able to pound on the tank to get it to my shop. I have an 87 325 parts car laying around and there was actually a fuel pump laying on the floor and it looked fairly new so I threw it in. Car ran for about 5 days then I was driving on the freeway and all of a sudden had no power and the engine died. Couldnt hear the pump running so I got a ride to my shop and took the fuel pump out of the tank of my parts car and threw it in, the car started right up. Not sure why the first one died and didnt think much of it I continued on my trip which i was going about 1.5 hours north of where I live. About an hour of driving the fuel pump died again. Now I had to get a tow home and that sucked for my saturday.

    I am working on the car now and dont really know where to go with this one. The pump is getting power and there is no abnormal voltage drop. Another question the parts car I got this out of had a different fuel pump assembly; it only had 1 fuel line coming off of it like it was returnless? or cuz its a converable does it have a different return line? maybe they were just 2 improper pumps? Another note is the car does have a new fuel filter on it and runs fine. Any help is very appreciated!
    Jake Rawson - Media blasting * Powder coating * Fabrication * Service * Repair
    Tags: None
    • CCR Engineering
      Member
      • Jan 2009
      • 41
      #2
      Make sure with the pump on and the car running you're getting proper voltage to the pump. If the voltage is low it will cause the pump to die early.

        Comment

        • 416stroker
          R3VLimited
          • May 2008
          • 2448
          #3
          Whats the build date on the 87?
          84 318I Delphin RIP
          87 325IS delphin 24v Sold
          89 325 Alpineweiss

            Comment

            • b*saint
              No R3VLimiter
              • May 2006
              • 3794
              #4
              Even if it has enough voltage I would make sure its not drawing too much amperage. That'll smoke it too. Do you have an amp clamp?
              Ma che cazzo state dicendo? :|

                Comment

                • ethirdy
                  E30 Addict
                  • Nov 2007
                  • 406
                  #5
                  EXACT SAME PROBLEM. Have a 1991 318i, fuel pump was bad, had a 1991 convertible around for parts, pulled the pump - found the same problem you did, the vert had no return line on the carrier. So I popped the pump out and wired it into the carrier for the 318i. Put it in, lasted for a week or so, then bleck - done.

                  Pulled ANOTHER fuel pump out of an 89 coupe - put it in the 318i fuel pump carrier for the same reasons (no return line on the 325i carrier), put it in, drove it for - yep, another week.

                  Just broke down on the highway last night - just gave out and wouldn't fire back up. Period. So I had it towed back home and went online to find another pump - I'm all out of donors :)

                  Euro Depot has a few - and they SPECIFICALLY state that the 318i pumps are different than the 325i pumps. Fitment/current/draw issues arise and it looks as though the 325i pumps just don't work in the 318i's, for whatever reason. So I'm gonna order a 318i specific pump and call it a day - hopefully.

                  PS - any idea where/which relays/fuses control the fuel delivery? I had hoped it was that simple, but doesn't look as easy to diag as a 325i (relays on the fenderwall).

                  Let us know how you make out - I'll do the same!
                  Originally posted by alpinaclone
                  Since the real economy is in the shitter, I say we start our own.

                  This is how it works; you buy my junk, then I will buy more junk and so on so forth etc. etc. Think of the future of your children and buy my stuff.

                    Comment

                    • LEANE30
                      E30 Modder
                      • Apr 2006
                      • 838
                      #6
                      very interesting. I figured the different part numbers were primarily due to draws. ...documentation on these m42's sucks my left nut.

                      I've been looking for anyone who is successfully running an alternative pump to the OE part#. i've had good luck with Walbro brand pumps in e30s before, haven't tried one in a 318i yet though. would be nice if i could go that route though, $100 verses $300 is a no-brainer.

                      does anyoneknow the specs on the factory pump? there's gotta be a unit out there that would be a better choice than the OEM suggestion.
                      ...what hasn’t been done to an m20 yet?

                      m20 Oil Stencil

                        Comment

                        • av8drvr
                          Advanced Member
                          • Sep 2008
                          • 100
                          #7
                          Originally posted by LEANE30
                          very interesting. I figured the different part numbers were primarily due to draws. ...documentation on these m42's sucks my left nut.

                          I've been looking for anyone who is successfully running an alternative pump to the OE part#. i've had good luck with Walbro brand pumps in e30s before, haven't tried one in a 318i yet though. would be nice if i could go that route though, $100 verses $300 is a no-brainer.

                          does anyoneknow the specs on the factory pump? there's gotta be a unit out there that would be a better choice than the OEM suggestion.
                          Check out this link to M42Club. Just what you need. http://www.m42club.com/forums/showth...2063#post82063

                            Comment

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