Talk Morgan Forums Morgan Sports Cars Morgan Three Wheeler & Super 3 Help needed - Fuel leak

Hi folks,

It seems every year I develop a fuel leak on the right side fuel inlet (?). I'm referring to crimped hose connection that bridges the left and right side cylinders just above the throttle body. I have twice replaced both the hose and clamp (I used the original style clamp, not a threaded screw type) and I am leaking once again. Has anyone else had this issue and/or converted to braided lines and threaded fittings?

As always, thanks in advance for the support of this forum.

2015 M3W
S&S Stage II
Catless + cored exhaust.

Thanks,

Hi
Many of us on here have had similar issues and they have been resolved by replacing the crimp fittings with the screw type fuel clips.
Also it would pay to check the fuel hoses for damage to the internal layers as I have had this recently.
I was getting a small leak at certain times even with two fuel clips, as pressure forced a very small amount through the hose layers

Be wary as any fuel getting onto the windscreens will cause them to self destruct

Be sure to use specific fuel hose screw clips and not just the "ordinary" ones

Cheers

The ones with slightly bevelled edges (to avoid cutting into the tube wall) are best. Don't forget to replace the ones down the back of the engine (under the fan cowl) too.

https://www.hcl-clamping.com/38-mini-screw-or-petrol-pipe-clip-mollfam

Looks like it fits the description...

It helps immensely to use OEM spec fuel injection rated hose, as opposed to just basic parts store fuel hose. OEM quality hose FI rated holds up better to the current fuel "brews" sold these days, including ethanol fuels. Low end fuel hose tends to shrink fairly rapidly in the presence of modern fuels, effectively reducing tension from whichever hose crimp you use, leading to leaks. Measure the hose diameter at time of install with precision caliper then a year later, and you'll see it.

As for the hose crimps, this forum would have you believe crimp types are inferior to screw type, which simply isn't true. BUT you must use a full 360 degree overlapped type sized properly for the application, such as made by Oetiker, which will happily maintain proper tension for years IF the hose doesn't shrink. This type of crimp is what's successfully used by the millions with automotive OEMs, in the Morgan submersed fuel pump module, and millions of homes that use PEX tubing plumbing. As the crimp type takes more care in selection, sizing, and installation, a screw type is probably best for most home mechanics. And a screw type crimp is easier to nip up once in awhile, though you can certainly do the same with a crimp type.

But really the underlying issue is the hose shrinking in diameter over time, so start there.

offhand, anyone know the diameter of the hose? Thanks.

8mm, or 5/16" for the rubber hose.

Thanks, Steve. Love your mods.