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Path: utzoo!watmath!clyde!burl!ulysses!mhuxr!mhuxn!ihnp4!houxm!vax135!cornell!uw-beaver!tektronix!hplabs!hpfcdc!hpfcla!dgrif
From: dgrif@hpfcla.UUCP
Newsgroups: net.auto.tech
Subject: Re: Orphaned Response
Message-ID: <26400001@hpfcdj.UUCP>
Date: Mon, 2-Dec-85 16:47:00 EST
Article-I.D.: hpfcdj.26400001
Posted: Mon Dec  2 16:47:00 1985
Date-Received: Mon, 9-Dec-85 03:40:41 EST
References: <2922@vax4.UUCP>
Organization: 02 Dec 85 14:47:00 MST
Lines: 17


   I think that the possibility of vapor lock between the
fuel pump and the carburator is not possible for the reason stated
by 'marauder' but don't forget the input side. A fuel pump cannot
"suck" very well and it is possible to boil gasoline just at the
fuel pump  input. This increase in vapor pressure just ahead of the
intake causes enough pressure to prevent the pump from drawing in
liquid gasoline. I know this can happen because I drive a 1-ton Chevy
van that did exactly this. Of course the problem (hot gasoline) was compounded 
by a poorly installed dual exhaust that heated the gasline all the way
from the tank to the fuel pump. The second exhaust pipe was positioned
about 3 inches from the gas line. I finally cured the problem by re-routing
the gas line and for good measure installed an electric fuel pump. Now I
have no problems and can insure that the liquid input to the fuel pump
is not much above ambiant temperature.
        Dan Griffin
        ihnp4!hpfcla!griffin