hot fuel module

[Ward]

Interesting, we dont see many TBI injector problems in California, is there
a gas quality problem, The only failure  I have wittnesed was failure to
inject after sitting for a long period of time. A sharp rap w/screwdriver
handel fixed that.

The pressure hold problem will cause several problems with PFI, Hard
starting in the mian symptom. Since the pump is held running by the Hobbs
switch, the pressure will eventualy come up as oil pressure si applied. 

As the the Vapor issue, how can you have any vapr in a re-circulating fuel
system, particularly when your always opening the valves (injectors)?
Ward



On Sun, 01 Aug 1999 18:20:03 -0400, Shannen Durphey wrote:

> Ward wrote:
> > 
> > No it can't but why would you want to ?
> 
> It seems to have no practical use, but one of the things the module
> does is keep the pump running after the key is off.  I can't see how
> this will prevent a real hot soak problem, as heat can be a problem
> for up to 1/2 hour after the engine's shut off.   But whatever the
> designers were after with extended pump operation doesn't seem to be
> possible with ecm alone.
> > 
> > The current GM spec for most EFI fuel systems is that thay must maintain
max
> > pressure (typicaly 3 bar or 45 PISG) not to drop less than 10 PSIG in 5
> > minutes.
> Lots of vehicles I've seen do not meet that spec.  I don't even
> consider pressure loss after the pump stops to be a problem unless the
> owner's complaining specifically of extended crank times.
> > 
> > Else you have a leak, injector, pump line check or in the tank.
> Most of my experiences (tbi truck) have been with the pump check
> valve.  This 8 cyl TPI stuff comes in with a surprisingly large number
> of bad injectors. 
> Shannen
> > 
> > Ward
> > 
> > On Fri, 30 Jul 1999 21:05:16 -0400, Shannen Durphey wrote:
> 





________________________________________________________________
Get FREE voicemail, fax and email at http://voicemail.excite.com
Talk online at http://voicechat.excite.com