[Gmecm] TBI Fuel problem

Tue Aug 15 00:19:57 UTC 2006

Yes...use the frame as a heat sink...

Lyndon.

----- Original Message ----- 
From: "DV Fagan" <dvfagan at yahoo.com>
To: <kc5aeq at earthlink.net>; <gmecm at diy-efi.org>
Sent: Monday, August 14, 2006 5:39 PM
Subject: Re: [Gmecm] TBI Fuel problem

> Craig,
> Why not move the lines inside the frame rail? 
> Assuming you have them.  The fuel will stay cooler.
> Dennis
> 
> 
> 
> --- Craig Smith <kc5aeq at earthlink.net> wrote:
> 
>> Darryl
>> 
>> I confirmed it today with an ir temp gun it appears
>> the fuel is getting hot
>> in the tank 120 F  and flashing of between the tank
>> and the inlet of the
>> fuel pump.  The heat is coming from the Exhaust
>> manifold Thru the TBI (
>> 4cyl engine both manifolds stacked on one side of
>> the engine).
>> Has anyone had experience with insulation tapes etc.
>> to insulate between
>> the manifolds?
>> 
>> Craig
>> 
>> 
>> > [Original Message]
>> > From: <dgilbert78 at juno.com>
>> > To: <kc5aeq at earthlink.net>
>> > Date: 8/12/2006 7:30:23 PM
>> > Subject: Re: [Gmecm] TBI Fuel problem
>> >
>> > There you answered your question. The pump stopped
>> working , or the pump
>> > blew open a bypass valve, but no pressure when you
>> dead headed it
>> > apparently pump is not pumping or it went into a
>> bypass mode
>> > internally???
>> > darryl..
>> > On Sat, 12 Aug 2006 19:09:39 -0500 (GMT-05:00)
>> Craig Smith
>> > <kc5aeq at earthlink.net> writes:
>> > > I have a guage inline at the discharge of the
>> pump.  The pump is 
>> > > capable of 45# I'm using the carter external
>> pump that is designed 
>> > > for TBI add ons its a rotary vane pump.  When
>> the pressure droped I 
>> > > pinched the return line off at the TBI pressure
>> still stayed at near 
>> > > zero.   I pulled the tank checked the pickup no
>> strainer no 
>> > > restriction. 
>> > > 
>> > > I wish there was enough room to run an in tank
>> pump.  
>> > > 
>> > > 
>> > > 
>> > > -----Original Message-----
>> > > >From: dgilbert78 at juno.com
>> > > >Sent: Aug 12, 2006 6:32 PM
>> > > >To: kc5aeq at earthlink.net
>> > > >Subject: Re: [Gmecm] TBI Fuel problem
>> > > >
>> > > >Are you monitoring fuel pressure someplace with
>> a pressure gauge 
>> > > or
>> > > >something?? the TBI system is pretty simple.
>> You have a pump 
>> > > pumping at
>> > > >least 18lb pressure and enough volume for the
>> injectors being used. 
>> > > The
>> > > >regulator is regulating fuel pressure at the
>> injector inlet 
>> > > typically 13
>> > > >lbs. The overflow fuel free flows back to the
>> tank. Possibly a 
>> > > fuel
>> > > >filter problem, possibly fuel supply starving
>> from pluged fuel 
>> > > pickup.
>> > > >Check if pump can deliver the required volume
>> at required pressure, 
>> > > not
>> > > >much left
>> > > >good luck
>> > > >Darryl...
>> > > >On Sat, 12 Aug 2006 18:16:19 -0500 (GMT-05:00)
>> Craig Smith
>> > > ><kc5aeq at earthlink.net> writes:
>> > > >> I pulled the cap and ran it same thing. 
>> > > >> I'm wondering if the fuel is flashing off
>> between the tank and 
>> > > >> pump.
>> > > >> 
>> > > >>   
>> > > >> 
>> > > >> -----Original Message-----
>> > > >> >From: dgilbert78 at juno.com
>> > > >> >Sent: Aug 12, 2006 6:05 PM
>> > > >> >To: kc5aeq at earthlink.net, gmecm at diy-efi.org
>> > > >> >Subject: Re: [Gmecm] TBI Fuel problem
>> > > >> >
>> > > >> >Hello: Try the test with the fuel filler cap
>> loose??
>> > > >> >Darryl...
>> > > >> >On Sat, 12 Aug 2006 17:37:10 -0500
>> (GMT-05:00) Craig Smith
>> > > >> ><kc5aeq at earthlink.net> writes:
>> > > >> >> Everyone
>> > > >> >> 
>> > > >> >> I'm having a fuel pressure problem with a
>> conversion we're 
>> > > >> >> performing on my fathers MGB.  The fuel
>> system is plumbed just 
>> > > as 
>> > > >> a 
>> > > >> >> stock Chevy TBI system running at 16# With
>> an external Carter 
>> > > 
>> > > >> fuel 
>> > > >> >> pump mounted in the right hand battery box
>> about three feet 
>> > > from 
>> > > >> the 
>> > > >> >> tank.  The fuel return from the tbi is
>> plumbed back to the 
>> > > tank 
>> > > >> >> dumping about an inch from the tank
>> bottom. 
>> > > >> >> 
>> > > >> >> After running for about 5 miles I'm
>> loosing fuel pressure.  It 
>> > > 
>> > > >> acts 
>> > > >> >> like a vapor lock condition.  After it
>> sits a few minutes it 
>> > > >> cranks 
>> > > >> >> and runs fine until it heats back up.  I
>> figure I'm picking up 
>> > > 
>> > > >> heat 
>> > > >> >> from the engine compartment.  Has anyone
>> placed an aftermarket 
>> > > 
>> > > >> fuel 
>> > > >> >> return regulator downstream of the pump
>> returning to the tank 
>> > > and 
>> > > >> 
>> > > >> >> blocked the return at the TBI?  Is the
>> fuel return thru the 
>> > > TBI 
>> > > >> used 
>> > > >> >> to cool the injectors, or does it have
>> another purpose? 
>> > > >> >> 
>> > > >> >> Thanks
>> > > >> >> Craig
>> > > >> >> 
>> > > >> >> 
>> > > >> >>
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>> > > >> >> 
>> > > >> 
>> > > >> 
>> > > >> 
>> > > >> 
>> > > >> 
>> > > 
>> > > 
>> > > 
>> > > 
>> > > 
>> 
>> 
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> 
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