>From what Vortech explained, it's 12 parts fuel to 1 part air. Not
pressure. I've watched the fuel pressure under boost conditions and it
ranges from +1psi - +25psi on the 12:1 and from +1psi - +20psi. And,
there's no return line on our systems so it can't get back to the tank.
They use the inline pump as a pseudo-return (a loop actually) that isn't all
that efficient...i'm having a 1/16" return line fabricated to avoid "vapor
locking" the fuel lines. Yes, this happens even on FI systems when there's
no return line. The fuel line gets hot and it vaporizes the fuel...causing
air bubbles which really plays nastys on the injectors.
- Bernd
-----Original Message-----
From: owner-dakota-truck@buffnet.net
[mailto:owner-dakota-truck@buffnet.net]On Behalf Of DICEMAN469@aol.com
Sent: Thursday, August 31, 2000 7:06 PM
To: dakota-truck@buffnet.net
Subject: Re: DML: FMU's ---> was: Injectors
In a message dated 8/31/00 8:03:46 PM Eastern Daylight Time,
miggitymike@juno.com writes:
> okay, I'm stumped. What's an FMU and what does it do?
>
> -miggitymike
It increases rail line pressure with increasing boost. It's measured in
ratios of psi/fuel line to psi/boost (I.E. 12:1 mean 12psi rail line
pressure
increase per 1psi boost) It increases the pressure by closing the
return-to-tank line and preventing the fuel from escaping back to the fuel
tank.
There ya go!!
-Austin
Vipertruck
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