Marv

It was running just fine today and stopped for some last minute Christmas shopping, but when I went to leave the store today, I got a few hundred feet, then it suddenly started running really, really rough.

The car would idle, but as soon as you gave it gas it would start missing really badly. I was able to nurse it into a parking lot, but it barely starts now.

Any ideas where to start looking?

oldskews4

VarioCam valve 99610530371

993GT

in-tank fuel pump hose

Marv

Actually, it looks like the fuel pump went out. Got 3 lbs of pressure.

The bad news is that there are no pumps available in the US, so it has to come from Germany.

DHI

These original pumps are a known weakness and the pump assembly has been subject to revisions and updates over the years.
Some folks repair the bursted hose with a part out of a Volvo catalog.
I don't have the part number myself... maybe you can search for this online.
I imagine that the parts store can supply generic fuel resistant hose for the repair.
Porsche does not offer separate serviceable replacement parts for the pump's appendages as you probably discovered.

black04

The hose could be leaking resulting in the low pressure. Even if the pump is still good, most any mechanic will replace the pump as well, so you don't come back in a year with a bad pump.

No pumps in the US? You know that is some kind of lie, don't you?

AudiOn19s

it's likely the hose on the pump not the pump itself.

Wayne K

Is it time or miles that causes the failure?

Marv

127K miles on my clock.

I had a reputable indy look at the car and confirmed it was the pump that failed, not the hose.

Not a big deal, I guess.

powdrhound

I ordered a new OEM GT3 pump assembly from Germany a few weeks ago. I only need the lower part of the basket so if anyone wants a new pump with the lines just let me know..

knorrena

My pump failed this year too. The whole upper green assembly was cracked. The pump flopped around during long hard left hand turns and the car stalled on the track.

I too had to wait for a new one from Germany. Its easy to change. I had the older version of the pump without the rubber hose that tends to fail. I wanted to change out to the newer version, but it looks like the mount on the bottom of the tank is different between years.

Backmarker

127k miles- original engine/no rebuilds?

Matt Lane

I had my pump hose pop off. Fun stuff (it was a full tank).

Fortunately not the fuel pump itself, just the inconvenience.

M

ColoradoGT3

Likely failure due to ethanol in gasoline.

black04

13 years of Ethanol exposure. Yeah, that's the cause. Ha :-)

Besides, the OP states that his shop says it was the pump, not the hose.

After some research, I understand that the older 996 had original pumps with a short section of rubber hose. That submersible hose is only good for a few years. Posters who had split hoses and replaced it with more of the same hose had continuing problems (I have a 2005 Italian motorcycle that specifies that in-tank hose be replaced every 2 years.)

Newer Porsche pumps apparently have all plastic hoses, that don't have the limited lifetime