LT1 LOW FUEL PRESSURE

[Luke Joseph]

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?!
> > ===========================================================