LT1 LOW FUEL PRESSURE

[Luke Joseph]

I finally had a chance to check the fuel pressure and  start the car after
fixing the hose in sending unit and she ran like a top.  It almost seems to
good to be true.  It has been raining so I had very little traction but that
LT1 feels a lot better than that old 305.  I still have a couple of dozen
little things to do including the VSS/speedo.  I plan on doing a search on
the archives for info but, can any one tell me how the ECM decides to shift
gears and what, weight, gear ratios and tire size has to do with it.  Also
since the tranny(4L60E) is digitally controlled is it possible to have a
manually activated tranny from buttons on the steering wheel. Kind of a poor
mans version of the system used on indy cars.  
	Thanks and if you have previously addressed these issues tell me a
key title to search in the archives.
		Luke (85 Monte Carlo SS w/95 cop LT1-4L60E)

> -----Original Message-----
> From:	nacelp at jvlnet.com [SMTP:nacelp at jvlnet.com]
> Sent:	Wednesday, October 20, 1999 12:14 PM
> To:	gmecm at efi332.eng.ohio-state.edu; 'gmecm at efi332.eng.ohio-state.edu'
> Subject:	RE: LT1 LOW FUEL PRESSURE
> 
> I've seen that in dribs, and drabs.  At one time we had a real problem
> with
> H2O, in the fuel around here, and then with high alky content, and during 
> both episodes, there were min, but many more soft hose "failures".  Carbs 
> weren't really effect, but several TBI's, and many more TPI's
> Grumpy
>   Also, good reason to replace as much else where as possible with AN, 
> specially around any ignition stuff.
>   Matha Stewart going public!!!!!
>   After her ignoring the Holiday Invitations from CSH, HQ for over a year 
> now, I'll be darned, to now extend the invitations again.
>   What next Ralph Nader, and joan Claybrook, going public!!!!!!!!!!!
> 
> 
> >I pulled the sending unit out last night and sure enough the hose
> connecting
> >the pump to the fuel line had split.  It was a real soft spongy type of
> >hose.  My guess is that they purposely made these hoses to blow out first
> in
> >case of high pressure.  That way you have the fuel spill contained in the
> >tank.  Anyway, I replaced it with some F.I. hose and some hose clamps.
> The
> >question now is, if there is a restriction in the supply/return large
> enough
> >to cause this or is it just a piece of crap hose to start with.  I think
> I
> >will do the flow test first in to a gas can on the supply side and maybe
> do
> >some thing similar on the return to check for any large restrictions.  By
> >the way the return is 5/16 all the way back until it gets to the gas
> tank,
> >there it switches over to the 1/4 line, which is the return on the
> sending
> >unit.  Looks like many of you hit the nail right on the head THANKS FOR
> THE
> >HELP!			
> >					Luke
> >> -----Original Message-----
> >> From:	Shannen Durphey [SMTP:shannen at grolen.com]
> >> Sent:	Tuesday, October 19, 1999 8:22 PM
> >> To:	gmecm at efi332.eng.ohio-state.edu
> >> Subject:	Re: LT1 LOW FUEL PRESSURE
> >> 
> >> David A. Cooley wrote:
> >> > 
> >> 
> >> Also, the isolator used on some systems is an oval shaped
> >> > >piece of plastic that slips over the sender and pump.  It can leak
> >> > >arounf the pump/isolator or isolator/sender union.  I found enough
> of
> >> > >these that every car equipped with one gets a new part if the pump's
> >> > >replaced.
> >> > 
> >> > With the problems the GN's had with the isolator, Every pump I
> replaced
> >> I
> >> > threw the isolator away and replaced it with a short piece of FI hose
> >> and 2
> >> > metal clamps!
> >> > 
> >> That's the best move.  Some people really notice the noise the pump
> >> can make.  Amazing how someone who can't hear will complain about the
> >> tiniest of squeaks and rattles.  Just drives a man nuts.
> >> Shannen
> >> 
> >> > ===========================================================
> >> >             David Cooley N5XMT           Internet:
> N5XMT at bellsouth.net
> >> >       Packet: N5XMT at KQ4LO.#INT.NC.USA.NA   T.A.P.R. Member #7068
> >> >     Sponges grow in the ocean... Wonder how deep it would be if they
> >> didn't?!
> >> > ===========================================================
> >