GothingNC

Within the past couple of weeks the SC Targa is takes a bit longer cranking up before starting up.

Mornings are fine, one turn of the key.
Parked after driving for a few hours - starts first turn of the key.

After 5 hours it takes about 5 - 10 seconds of cranking to fire up.

Looked under the front stone guard and noticed moist fuel on the fuel pump banjo fitting cap.
(I replaced the washers last year when I removed the fuel pump, old ones leaked right away when re-used)

Going to pick up new crush washers and an end cap so see if it solves the problem.

Make sense for being a cause of the starting issue?

John

lfe132

I had a similar problem; turned out to be the fuel regulator and fuel dampener. ('84 Carrera)

GothingNC

I don't have those parts and my accumulator is about 5 years old.

John

theiceman

Well John best to start with the obvious i guess.
i guess you could be losing fuel pressure there

Hobbsie

I did a lot of CIS diagnosis on European cars back in the day. To pressure-test the system, the setup is to disconnect the line between fuel distributor and warm-up regulator and substitute a gauge with a shut-off valve in line. There are normally three mechanisms of fuel leakdown when engine is shut off which cause a restart problem: fuel pump check valve, primary pressure regulator in fuel distributor and warm-up regulator. None of these should leak down when the pump stops and the engine is off. Closing the inline valve of the test rig eliminates the warm-up reg from the equation. That is, if you see the pressure falling when engine is shut off, close the valve and the pressure stops falling, this shows the w/u reg is leaking. Closing the valve with engine running gives the primary pressure, which should be high. Lastly, watching the pressure change on a cold start up as it warms up monitors the operation of the warm-up regulator, which acts like a choke on carbureted engine.

I suggest finding a shop that can do a pressure test instead of fooling around with guess work. Just my 2¢.

GothingNC

Hobbsie,

Thanks for the info.

I'm going to fix the fuel seepage at the fuel pump first and and then have my brother check out the fuel pressure if the problem still persists.

John

911vet

John: The one and only time my 87 was slow to start, I drove to work and smelled gas. There was gas spraying all over my hot engine. There was a hole in one of the fuel lines. It was extrememly dangerous and I feel lucky to still have a car. The car was slow to start, ran fine after. So, I'd say yes, a fuel leak can cause a slow start.

khooper

i,m in exactly the same situation,. injectors hold pressure,. but i wonder if the pump has some internal 1 way valve etc. i think i need to go into some new car parts store to avail new injector..

GothingNC

I will be picking up the fuel pump check valve and crush washers at the local porsche parts place today.

Should only take me about 30 minutes to replace unless I forget to use the handbrake and the Porsche starts rolling down the driveway.

John

theiceman

That would be me ......

BLOND944

Another really cheep band aid is to let the key sit in the on posision for 6-8 seconds before tapping the started. Just thinking budget fix. It gives the pump time to come up to full pres. Works for me.

GothingNC

Well I changed the crush washers and installed a new check valve end cap last weekend and all is well

John

theiceman

here is John looking for his gas leak

PS Blond that would not work , the pump only runs while cranking ,

http://www.youtube.com/watch?v=O3cybtQWDtk

GothingNC

Holy smokes, can't beleive he did that but I hope his burns are not severe.

My cousin had 3rd degree burns on his upper torse and face when someone turned on a light switch that set off a methane gas explosion when he was working at the municpal landfill along with two others who are in worse shape

He is still recovering 15 years later physical and emotion.

John

GothingNC

Well the problem is back.

Cold and hot starts are fine, just warm when sitting for more then 3 hours.

I will be checking fuel pressure next and leaking injector(s).

John