fuel delivery problem?

[ralexander03@snet.net (Rick Alexander)]

Ok Eric, they "suck" from the tank but if you don't pressurize the fuel it
will never get into the combustion chamber and fire. We are both right, it's
just that we were talking about different things.

I was responding to: "Fuel pump relay: if it worked intermittently would the
engine be able to mechanically suck gas for a short period of time maybe
creating an air lock situation?  I know this can be the case in some
diesels...". My point is that the engines themselves (pumps aside) can not
"suck" fuel. Yes, diesels can be air bound, it's happened to me. Quite a bit
recently since our off road excursion on the way to Texas. Have to figure
out what that is too.

Rick Alexander

----- Original Message -----
From: "Eric S" <scirocco81@vwmail.net>
To: "Rick Alexander" <ralexander03@snet.net>; <scirocco-l@scirocco.org>
Sent: Friday, December 27, 2002 6:48 PM
Subject: Re: fuel delivery problem?


> Rick, your dead wrong on diesels.  They require no pressure.  The pump is
stuck to the motor, and litterally does suck fuel from the tank.  Many VW
diesel owners have problems with air getting into the lines from leaks in
the line coming from the tank to the engine, or the fuel filter flange
leaking air into the system.
>
> --
> Eric
> Northglenn, CO
>
> 81 Scirocco S (*TDI* swap and complete restoration in holding pattern)
> 81 Rabbit Truck LX Diesel (Waiting for BAE Turbo Install)
> 83 Scirocco Wolfsburg
> 91 Cabriolet (2.0 Crossflow 8v swap and mechanical rebuild in progress)
>
>
> --- "Rick Alexander" <ralexander03@snet.net> wrote:
> >Ryan,
> >
> >This engine can't "suck" fuel neither can a diesel. They need pressure.
In
> >the case of the diesel, when they run on it's because they are worn out
and
> >are being fed crank case oil. But that is a very wasted engine.
> >
> >Go with Dave's lead and look for a cracked intake boot. That's probably
what
> >it is.
> >
> >Rick Alexander
> >
> >----- Original Message -----
> >From: "Ryan Ruggles" <ryanruggles@uniserve.com>
> >To: <scirocco-l@scirocco.org>
> >Sent: Friday, December 27, 2002 1:43 PM
> >Subject: fuel delivery problem?
> >
> >
> >> Details: 1.8L JH, CIS injection in a 82 rabbit.
> >>
> >> Problem(s):
> >>
> >> Almost every time I hammer the throttle, the engine starts to rocks
back
> >and
> >> forth and idle goes way down
> >>
> >> It is like it's running on 3 cylinders but it can't be an electric
problem
> >>
> >> When I drive it in this condition it sputters until about 2000 rpmn and
> >then
> >> smooths out but as soon as I come to a stop again the engine rocks back
> >and
> >> forth (along with the car ;( ) and the idle is really lumpy.
> >>
> >> It used to go away after I shit it off for a few seconds but it has
been
> >> running like shit for a couple of days now.
> >>
> >> Things I have done to try to figure out the problem:
> >>
> >> 1)  Changed fuel filter
> >> 2)  Changed fuel pump  (there is only one)
> >> 3)  New injectors
> >>
> >> Things that are suspect:
> >>
> >> 1) Fuel line from fuel pump to accumulator is rusty ( maybe partially
> >> collapsed internally?)
> >>
> >> 2)  The accumulator is as rusty as Micheal Jordan's dribbling skills ;)
> >> (maybe it's not doing it's job and the engine is trying to get more
fuel
> >> than it is being supplied?)
> >>
> >> 3)  Fuel pump relay: if it worked intermittently would the engine be
able
> >to
> >> mechanically suck gas for a short period of time maybe creating an air
> >lock
> >> situation?  I know this can be the case in some diesels...
> >>
> >>
> >> If anyone has any suggestions I'd totally appreciate it.
> >>
> >> Cheers,
> >>
> >> Ryan
> >> 82' Rabbit
> >> 87 Scirocco 1.8L 16V  now in the form of a 1.5 foot square cubed
> >> 84 Scirooco 1.8L 8V    RIP
> >>
> >>
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> >>
> >
> >
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