3.5.3.8 - High Pressure Fuel Systems - Need a bit of help.

[Richard Lewis]

Just a question asking for a few peoples interpretation of a rule.

"High pressure over 15psi fuel systems must utalize protected hose with either threaded fittings or modern OEM type fittings used without modifications to either the hose or fittings. A hose clamp over a removeable line of any type is not permitted on a high pressure fuel line."

I'm a bit confused by what "modern OEM type fittings" are. Until I read the last sentance of the rule, I assume they mean the barbed fittings that most cars use, with the permantnetly bend (non adjustable) hose clamps in place. ie: no worm gear clamps.

Due to our FPR (a bosch one, with barbed conenctions) not having threaded connections, as well as our fuel pump not having threaded connections, this is a bit of a problem. Do most teams simply spend more and get a pump/FPR with the treaded NPT holes, then use Aeroquip style fittings?

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[Dan Deussen @ Weber Motor]

Walbro in-tank fuel pump assembly with built in fuel pressure regulator. Non-return system. 1/4" NPT outlet. ~5bar. I think it is used on a Buell motorcycle.

Aeroquip AN-3 braided fuel fuel line all the way.

[Dan B]

Might be a bit late but here is some good info from the old email list.

http://www.escribe.com/automotive/misc/formulasae/m5115.html

[PatClarke]

Hi Richard, you are correct, the rule does not permit worm drive hose clamps, however on barbed fuel line fittings, the 360 degree plus clamps with a screw fitting into a captive nut is perfectly acceptable.
Lee.

Rudeness is a weak mans imitation of strength