Hmmm so he says that there is no fuel pump, or fuel delivery system, in the
fuel tank? I am definitely not sure on this.
Maybe that is the main fuel pump for your vehicle.

I have seen a lot of crud in fuel tanks that only clog the pickup strainer
after running for awhile. Then of course when the engine stalls the vacuum
that is created by the fuel pump drops to "0" and the crud falls back to the
bottom of the tank. Then you can start the engine again and start this
cycle all over again.

And like you said you removed the gas cap and it seemed better. Maybe there
is a vacuum created inside of the gas tank that might cause a reduction in
fuel pump pressure.

Fuel pumps need to create not only pressure but also volume. The ruptured
fuel pressure regulator would probably only cause a very slight drop in fuel
pressure. It is usally discovered when the vacuum lines to it are examined
with the engine running. Of course some signs will be an engine that is
idling rough, bad mileage, etc.

Hmmm since you said that your cap was replaced then I will assume that your
'99 still has an ignition coil (transformer). That might be your problem
and I only recommend purchasing them from the dealer. I have had problems
with aftermarket brands.

good luck!
--
later,
dave
(One out of many daves)


"andrea" > wrote in message
ups.com...
> Hi Dave,
>
> I am so psyched that you wrote back. Yes it is the 2.0 and the car
> only has one fuel pump. My mechanic checked the fuel pressure and the
> fuel regulator twice and they both checked out alright. He also
> thought/stated that if the fuel pump was starting to fail, it wouldn't
> be able to put out the pressure. Wouldn't that take care of the
> ruptured fuel regulator?
>
> Also I have gotten a check engine light...twice....not when it loses
> power and dies on the side of the road but twice when I let it idle for
> long periods of time with the AC on high and it stalled, which did not
> make my mechanic very happy! However, after all the times when I have
> let it idle like this is when it will then lose power a short time
> later. This is in addition to losing power on a number of others
> times when I am just driving "normal." In any case, both times when I
> got a code they were misfires, once in cylinder one, the other a random
> misfire. Today I have removed the gas cap thinking maybe there is some
> kind of clog, etc..in the Evaporative Emissions Control system. Seems
> to be a little better but it is hard to tell since the problem is so
> intermittent.
>
> I have not tied to connect anything to the ECM yet. Can you tell me
> more about it? I will also check it out online.
>
> Thanks a lot. I appreciate your help.
>
> Andrea
>
>
>
>
> One out of many Daves wrote:
>> Which engine in this 99 Golf? Sounds like a 2.0, but am not sure even if
>> this is a US model or what. I would ASSuME that since it is comcast that
>> it
>> is a US model. ;-)
>>
>> How many fuel pumps does your 99 Golf have? 2?
>> I would suspect a problem with the transfer pump in the fuel tank, if so
>> equipped.
>>
>> Possibly a ruptured Fuel Pressure Regulator that might allow gas to
>> travel
>> through vacuum hoses into the intake.
>>
>> also did you ever get an Engine Check Light?
>> Have you tried to hook up a ross-tech.com vag-com tool to the ECM to see
>> what was happening?
>> --
>> later,
>> dave
>> (One out of many daves)
>>
>> "andrea" > wrote in message
>> ups.com...
>> >I have a 99 vw gasolined powered gof that has an intermittent misfire,
>> > hesitaition, loss of power problem. It has pretty much always misfired
>> > but my main concern is the new (past 6 months) hesitiation/loss of
>> > power. It will completely die unexpectedly and then after a few
>> > seconds to a few minutes, it will restart. You can floor it and the
>> > tach barely moves and then it may suddenly grab and you're off! The
>> > problem is beginning to get much worse. Here is a list of what has
>> > already been done:
>> >
>> > New:
>> > MAS
>> > Gas Filter
>> > Catalytic convertor
>> > throttle plate
>> > wires, plugs, cap, rotor
>> > coil
>> >
>> > The vacuum lines, fuel pump pressure, and regulator have all checked
>> > out alright. The gas tank was drained and is clean. The fuel injector
>> > lines have been cleaned twice.
>> > I wanted to change relay 109 untl I realized that that was only for
>> > diesels (I think)
>> > and now want to change the relay for the fuel pump (#409) but I don't
>> > know where it's located (it's not in the panel)
>> > Most of the time the problem happens when the gas level is below half a
>> > tank and it will even repeatedly hesitiate going up a steep hill when
>> > it's below half a tank but not when full.
>> >
>> > Any thoughts/suggestions...if yousolve it I will take you out to
>> > dinner...as long as you're not a jerk!!!!! Thanks. Andrea
>> >
>