Fuel rail vaporization

[Rod Davis]

----- Original Message -----
From: "Daniel Collins" <bossute at one.net.au>
To: <gmecm at diy-efi.org>
Sent: Saturday, November 04, 2000 11:29 PM
Subject: Fuel rail vaporization

Also the question is where is the fuel pump? If it is outside the tank and
having to suck the fuel out of the tank then you are creating a lower
pressure area allowing the fuel to vaporize before the pump. A remedy is a
prepump in the tank, or the best is to move the main pump to the tank. Also
new fuel systems are moving to 100% fuel usage to the injectors with smaller
fuel lines and no hot fuel returning to the tank.
Rod Davis

> Howdy everyone , the weathers starting to warm up here Downunder  , I took
> the Ponty for a drive yesterday and now in traffic I am getting fuel
> vaporization problems at idle and part throttle. Outside ambient temp is
> about 35 deg , soon to rise to 40 deg as summer hits and the problem shows
> up when the intake air temp rises above 85 deg.
> I have already blocked off exhaust crossover in manifold , added auto
trans
> cooler to fuel line , moved the pressure regulator so that it is above the
> fuel rail. When it starts I can hear the fuel pump "groaning" and the
engine
> runs lean. Would raising the fuel pressure help or would it be better to
> have a bleed off to keep the vapor bubble out ( I assumed the pressure
> regulator would perform this function). has anyone experienced this and
> overcome it ? any help would be appreciated.
>
> Daniel Collins
> Hot Downunder
> Days like this makes yah want to fit aircon ! ,maybe I am getting spoilt
> driving a late model car during the week .
>
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