TPI for Chevy truck

[Bob Valentine]

At 08:38 PM 12/7/2000 -0500, you wrote:
>Matthew Johnson wrote:
>> 
>> I was thinking that the difference in fuel pressure between TBI and TPI was
>> great enough that the stock TBI switch for trucks might not be able to be
>> used.  If anyone knows anything one way or the other I would appreciate it.
>
>I would be wary of running high pressure with the plastic bodied GM
>tbi valve also.  Ford trucks were pfi when GM was using tbi.  They
>must have installed the high pressure pump after the valve, like
>Lyndon describes.

Just had a discussion about this with a "real" (it's his day job ;^)
mechanic friend about how Ford does dual-tank EFI.   Some use a pump in
each tank, then run the lines to a union.   There's a check ball in each
pump  to prevent drainback into the non-running tank. 

There's also a TSB about those checkballs sticking, causing hard starting
and fuel overflows....  an additional in-line checkball is the fix, but
those fail too.  

I don't know how fuel return is handled.  

-> Bob Valentine
-> bob at tecmark.com
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