First 986 project: Replacing water pump

[Bush Pilot]

From what I’ve read there’s a good reason Porsche used a composite impeller and I would recommend replacing with the same type of pump.

[Lowski]

I'm not sure what your EVAP problem is, but checkout this post. I posted some system description stuff I found online that helped me out a bunch.

Coke Bottle Noise / Fuel Filler Howling Noise

[LoneWolfGal]

Originally Posted by Lowski

I'm not sure what your EVAP problem is, but checkout this post. I posted some system description stuff I found online that helped me out a bunch.

Coke Bottle Noise / Fuel Filler Howling Noise

My EVAP problem is hard starting after a fill-up. From the research I've done and the advice from folks here, the problem most likely is with the charcoal cannister or fuel purge valve. A guy on YouTube who had the same problem solved it by replacing the cannister. I'm now searching for the cheapest source for those items, which so far seems to be eBay.

[Gilles]

Originally Posted by LoneWolfGal

. I'm now searching for the cheapest source for those items, which so far seems to be eBay.

I am pretty sure that you can check if the fuel purge valve is faulty or operating properly before starting swapping parts, otherwise can get expensive pretty quick..
And speaking of parts, I get great service and prices from Luke at Sunset Porsche in OR :-)

[Lowski]

Originally Posted by LoneWolfGal

My EVAP problem is hard starting after a fill-up. From the research I've done and the advice from folks here, the problem most likely is with the charcoal cannister or fuel purge valve. A guy on YouTube who had the same problem solved it by replacing the cannister. I'm now searching for the cheapest source for those items, which so far seems to be eBay.

My money would be on the purge valve on top of the intake. This valve is scheduled to open when the engine is running under certain conditions to suck the vapors from the canister to the intake and then eventually burn them. I believe the hard starting condition occurs when the valve sticks open and vapors get pushed into the intake from the canister while fueling. Once the intake is full of this fuel vapor mixture the engine doesn't want to start as the mixture is all messed up.

[LoneWolfGal]

Originally Posted by Lowski

My money would be on the purge valve on top of the intake. This valve is scheduled to open when the engine is running under certain conditions to suck the vapors from the canister to the intake and then eventually burn them. I believe the hard starting condition occurs when the valve sticks open and vapors get pushed into the intake from the canister while fueling. Once the intake is full of this fuel vapor mixture the engine doesn't want to start as the mixture is all messed up.

Do you mean the valve under the driver's-side intake manifold? After spending four days reading up on the EVAP system, that's the valve I zeroed in on. Several people whose 986 had the same symptom as mine fixed the problem by replacing that valve. What's somewhat confusing is the nomenclature folks use to refer to it: purge valve, purge solenoid, fuel vent valve, fuel system vapor valve, tank vent valve, etc. Hard to be sure they're talking about the same valve. My next move is to give Pelican a call, describe the problem, and see if I'm on the right track. And find out the valve's official name.

[LoneWolfGal]

Originally Posted by LoneWolfGal

My next move is to give Pelican a call, describe the problem, and see if I'm on the right track. And find out the valve's official name.

I called Pelican and talked to Glenn in parts, but he couldn't help me without a part number from the valve. At any rate, before I buy the valve I need to make sure the problem isn't just a plugged or leaky hose to or from the valve, which I understand is fairly common. A defective hose from the valve to the intake was forum member Luckyman01's problem, I believe. If it turns out the purge valve itself needs to be replaced, Glenn said none of the valves are all that expensive, and that was music to my ears.

[blue62]

Originally Posted by LoneWolfGal

I called Pelican and talked to Glenn in parts, but he couldn't help me without a part number from the valve. At any rate, before I buy the valve I need to make sure the problem isn't just a plugged or leaky hose to or from the valve, which I understand is fairly common. A defective hose from the valve to the intake was forum member Luckyman01's problem, I believe. If it turns out the purge valve itself needs to be replaced, Glenn said none of the valves are all that expensive, and that was music to my ears.

The various valves in the Evap system are simple valves either one way vacuum operated or electrical. Both very simple to test...
The rest of the system is composed of hoses and a canister so also very easy to test.
The major issue with the Evap system is access to all of the components.
If you have a schematic to the system and understand the layout....
you should be able to test much of it with something like a Handy Vac...with it you can apply vacuum and see if it holds over a period of time. If it does then you know the parts of the system your testing have no vacuum leaks.

[Gilles]

Originally Posted by LoneWolfGal

I called Pelican and talked to Glenn in parts, but he couldn't help me without a part number from the valve.

If you google Sunset Porsche Parts, you can enter the year and model of your car an have access to the PET, which has all the parts (with the correct part numbers for your car), then you may order from your favorite supplier.
.