Re: Exhaust Leak! (Hesitation)

[Bob Farrell <farrell@icdh16.dseg.ti.com>]

Although a '77 I had the same symptoms. Had to replace fuel pump. Part of 
the key is that the problem is worse at high ambient temperatures. The 
parts of the pump heat up and clearances open so it cannot maintain pressure.
Garages have difficulty finding it because they tend to work in the shade and
do what they can to keep the mechanics comfortable, which makes the problem 
go away. Sort of the FI equivalent to vapor lock, except the heat is ambient,
not from a hot engine. The pumps wear significantly if not pumping gas, so if
you've ever run out of gas, you're asking for it. Thats why gas gauges are
setup these days so when it says 'E' you often have a couple gallons left. 
The manufacturers do not want you running out of gas, not because of the 
"free" roadside assistance but because of the damage to fuel pump.

Then again, your car is different could be anything. 
                                
                                  Bob F. 
> 
> I think eric has this right, except I figure the fuel pump got weak from
> the clogged filter, then wore out.  when you replaced the filter you
> lightened its load abit.  
> 
> One other thought that comes to mind is fuel injectors, they give some
> strange hesitations and it always appears to be something else.  And if
> your filter clogged then some couldve gotten to the injectors.
> 
> check fuel pressure and injector spray, then let us know.
> 
> Kyle
> 
> On Thu, 15 May 1997 17:46:47 -0600 (MDT) Night Shadow
> <soltwede@ucsub.colorado.edu> writes:
> >> 
> >> OK two weeks ago you guys and gals responded to a problem I had with
> >> hesitation..I replaced the fuel filter and my problem went away. 15
> >> minuted ago on the way back from lunch it hesitated again badly.
> >> It is about 90 degrees today but it wasn't that hot when it 
> >hesitated
> >> before two weeks ago. The initial hesitation went on every day for 
> >about
> >> a week and a half. Now its back..is my filter clogged again..what 
> >could
> >> cause this?
> >
> >> Super M
> >
> >Fuel pump/transfer pump problem I think...probably the clogged fuel 
> >filter
> >strained the pump, now it's going out...(my 79 rocco has EXACT same
> >problem, it will get worse...car will stall...won't re-start for about
> >10-15 min....)
> >
> >
--
To subscribe or unsubscribe, send email to scirocco-L-request@privateI.com,
with your request (subscribe, unsubscribe) in the BODY of the message.