[Gmecm] TBI Fuel problem

[Craig Smith]

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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>> >> 
>> >> 
>> 
>> 
>> 
>> 
>>