Blew new fuel hose...cheap hose or something else?

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  • eight-0-eight
    Noobie
    • Aug 2020
    • 32

    #1

    Blew new fuel hose...cheap hose or something else?

    Hi all,

    So I just rebuilt my M20 and have had it running for a couple of weeks. Been taking it out for short test rides around the neighborhood, mainly been focused on getting the air out of my coolant lines. I've brought it up to temp idling about 10-20 times, and have taken it out numerous times, probably like in total 5-10 miles.

    Anyway on my drive yesterday, about a mile away from my house I started to smell a strong fuel smell so I pulled over immediately and popped the hood and saw that my supply fuel line into the rail split. 😳 Luckily I caught it as soon as it happened, that could have ended very badly. I had it towed back to my house.

    The fuel hose I used was stupidly bought on amazon so I'm chalking the fuel hose split to just buying a crappy hose and bad luck (maybe I nicked it when I was adjusting the intake manifold)....but I wanted to double check with all you experts here.

    Is there something else that I should be looking at that could have caused that or likely it was just the crappy hose and I should be good to go after replacing with a quality hose? I don't want to buy new hoses to have this happen again because of something obvious that I missed. The fuel pressure reg is new.

    I'm going to buy the Gates brand 5/16" ID fuel hose at Autozone/Oreillys unless you all have a suggestion on specific fuel hose brand I should get?

    Thank you all!!

    Click image for larger version  Name:	PXL_20260618_153918826.jpg Views:	10 Size:	174.2 KB ID:	10162873
    Last edited by eight-0-eight; Yesterday, 12:52 PM.
  • reelizmpro
    R3V OG
    • Dec 2003
    • 9531

    #2
    That doesn't look like it's rated for fuel injection. I had some CRP fuel injection hose fail after 5 years and replaced it with Gates Barricade. That seems to be the go-to aftermarket hose.
    "I'd probably take the E30 M3 in this case just because I love that little car, and how tanky that inline 6 is." - thecj

    85 323i M TECH 1 S52 - ALPINEWEISS
    88 M3 - LACHSSILBER
    89 M3 - ALPINEWEISS II
    91 M TECH CABRIO 2.7L TURBO - MACAOBLAU

    Comment

    • E30SPDFRK
      Moderator
      • Jul 2007
      • 5699

      #3
      Cheap hose issue. Use the Gates E85-rated hose, or OEM BMW only, all others will fail within the first few years.

      Also, the way that hose is swelling around the clamp makes me think it's too large, but there is a chance it is just swollen from not being pressure rated.
      Byron
      Leichtbau

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