[Gmecm] TBI Fuel problem

[Craig Smith]

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
> > >> >> 
> > >> >> 
> > >> >> _______________________________________________
> > >> >> Gmecm mailing list
> > >> >> Gmecm at diy-efi.org
> > >> >> Subscribe: http://lists.diy-efi.org/mailman/listinfo/gmecm
> > >> >> Main WWW page: http://www.diy-efi.org/gmecm
> > >> >> 
> > >> >> 
> > >> 
> > >> 
> > >> 
> > >> 
> > >> 
> > 
> > 
> > 
> > 
> >