Fuel pressure problems

[Pat Ford]

 I think you should check your return line pressure I bet its high (blocked) and the high fuel pressure is holding the injectors closed

Previously, you (Steve Cauffiel) wrote:
{ 	Okay fellas, I have an '88 Trans Am, 305 TBI. I just installed a Walbro HP
{ fuel pump today, figuring that the TBI's pressure regulator (which I've made
{ adjustable, BTW) will bring the pressure down enough to be usable. Well, to
{ make a short story long - I get no fuel from the injectors. I can hear the
{ pump running, my fuel gauge pegs (0-15psi) and the engine just cranks and
{ cranks - no gas. When I stop cranking, it takes several seconds for the
{ gauge to register the pressure before it drops to zero; I figure it's pretty
{ damn high causing the injectors to lock up. Concur?
{ 
{ 	So my next thought is to run another pressure regulator inline. I figure I
{ would do the following: (1) Install a Mallory 3 port return style regulator
{ in the rubber supply line, (2) "T" the return into my fuel return line at
{ the point where the line is the high pressure rubber, (3) run this regulator
{ at about 24psi - drop it to about 14 at the TBI using the stock FPR.
{ 
{ 	Do I have to change out the rubber lines to TPI "quality" lines to handle
{ that pressure? Or will those lines handle that pressure? (Hopefully they are
{ the same lines between TPI and TBI)
{ 
{ What do you guys think?
{ 
{ Could you please email me as well as send to the list?  I'm on digest and
{ there's no telling when I could get that sent...
{ 
{ Steve
{ 
{ (Before you ask, I went to this setup in preparation for a dual TBI rig on
{ my 383, which will eventually have twin turbos on it as well. My fuel pump
{ died on me Friday, so I figured now was as good a time as any , especially
{ since I only wanted to do this swap once.)
{ 
{ ----------------------------------------------------------------------------
{ To unsubscribe from diy_efi, send "unsubscribe diy_efi" (without the quotes)
{ in the body of a message (not the subject) to majordomo at lists.diy-efi.org
{ 

--
Pat Ford                           email: pford at qnx.com
QNX Software Systems, Ltd.           WWW: http://www.qnx.com
(613) 591-0931      (voice)         mail: 175 Terence Matthews          
(613) 591-3579      (fax)                 Kanata, Ontario, Canada K2M 1W8

----------------------------------------------------------------------------
To unsubscribe from diy_efi, send "unsubscribe diy_efi" (without the quotes)
in the body of a message (not the subject) to majordomo at lists.diy-efi.org