[Gmecm] TBI Fuel problem

[mark krawczuk]

hi,  would  a surge tank/ another sure tank help  ?

mark k


----- Original Message ----- 
From: "Craig Smith" <kc5aeq at earthlink.net>
To: <dgilbert78 at juno.com>; <gmecm at diy-efi.org>
Sent: Tuesday, August 15, 2006 8:44 AM
Subject: Re: [Gmecm] TBI Fuel problem


> Darryl
>
> The fuel is being heated up by the return from the TBI circulating back to 
> the tank.  When the temp at the inlet of the pump gets to about 110 is 
> when the pump cavitates.   I think the problem is compounded because the 
> pump is external, it is pulling the fuel out of the tank (lower pressure 
> the fuel flashes easier) Im going to pull the tank back out and see if I 
> can figure a way to add an internal pump.
>
> I figured out where were picking up the heat, It's between the intake and 
> exhaust manifolds. The Exhaust manifold for cylinders 2&3 run 1/2" below 
> the bottom of the center of the intake (directly below the TBI) the 
> exhaust manifold is runing 700 or so degrees F.  The base of the TBI was 
> over 200, I added some insulation and was able to lower the temp 
> considerably.   I have access to some real good insulation blanket we use 
> at work on high temp piping, that should get the heat transfer under 
> control.  Do you have anyone have any other suggestions?
>
> Thanks
> Craig
>
> P.S.  Carrying fire extinguisher on test drive.
>
>
>
>
> ----- Original Message ----- 
> From: dgilbert78 at juno.com
> To: kc5aeq at earthlink.net
> Sent: 8/14/2006 2:51:17 PM
> Subject: Re: [Gmecm] TBI Fuel problem
>
>
> Hmmm! That appears dangerous to me, don't know. Typically most TBI pumps 
> are located right in the tank. Fuel lines are than routed inside the frame 
> rails and exit in the vicinity of the engine. Where is this fuel tank, is 
> it not located at the rear of the car?? sounds like it is located in the 
> vicinity of the exhaust manifold??? is that correct?? Then the pump is 
> cavitating (sucking fumes)
> Darryl..
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