[Diy_efi] Question about TBI fuel pressure

[Fehn, Ron G]

MY EXPERIENCE IS THAT gm RATES THE tbi AT 12 LBS.  TThe TPI pump at 40
lbs will be regulated to 12 lbs and the balance is returned via the
return line.  no problem. the larger F P's may need a larger return line
if the dia is insufficient.  i think the 200 series walbro has had an
issue with needing the large return. add a FP gauge(non liquid).  some
later GM TBI run 36 lbs with smaller injectors(7.4L). i have never heard
of 5 lbs. 

-----Original Message-----
From: diy_efi-bounces at diy-efi.org [mailto:diy_efi-bounces at diy-efi.org]
On Behalf Of Jim Kyser
Sent: Thursday, September 22, 2005 9:24 AM
To: diy_efi at diy-efi.org
Subject: [Diy_efi] Question about TBI fuel pressure


I am adapting a TBI system to my 1946 Willys Jeep with a Buick V6. 
(yeah, I know I could adapt a Buick TPI setup but the parts are much 
more expensive)

My question regards fuel pressure. I would ideally like to run an intank

pump and am looking at the pump from a Pontiac Aztek. Basically, the 
pump and fuel level sensor are all mounted together in an assembly that 
bolts in from the top of the tank though the typical large opening. The 
problem is that the Aztek pump is for a TPI setup and puts out upwards 
of 40 PSI. I know that the TBI systems need more like 5 PSI. Could I 
just put a regulator inline to drop the pressure down?
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