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vapor lock - hot starting
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Posted by DougM [Email] (#211) [Profile/Gallery] (more from DougM) on Mon, 16 Nov 2020 04:07:06 Share Post by Email
In Reply to: Stranded!, Tom, Sun, 15 Nov 2020 16:25:20
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I've experienced it a few times over the years, and coming back from Hershey, PA in 2003 was probably the most extreme case that I can remember. Refueling after driving 200 miles and I was stranded for about the same time interval you experienced.

I googled d-jetronic vapor lock and found this bit of info:

"There is a non-return valve built into the pump which is intended to retain pressure in the rails after switching off with the intention of preventing vapor lock during a hot restart. Unfortunately this can still happen, partly because of the relatively low fuel pressure, and was a minor irritation associated with the D Jetronic system.

Because of the fine working clearances of the injector internals it is essential that no foreign particles can enter the fuel rails and a high quality filter is provided in the feed pipe as it joins the fuel rail. The filter capacity is not very great and it is important that it is changed at the recommended intervals."

Saabs don't have a filter up near the fuel rail, as they only have the one in the trunk above the fuel pump, but it wouldn't be that difficult to plumb another one into the engine bay. The stock filters in my opinion are fairly large, so having one clogged with enough debris to prevent proper fuel flow is not a reality. It's not all that expensive to buy a new one, though I don't know if you can still source an OEM style one. My car has had the same generic filter fitted since I brought it home in 2001.
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