Vapor Lock

[Admiral]

What are the symptoms of vapor lock? Can it happen while you're driving?

Today was the first really nice day of the year here in Michigan with temps in the low 70s. I took my car out for a drive of about 80 miles. The first half it drove beautifully but after that it started to lose power at certain points intermittently (seemingly around 45 miles an hour in high gear), which necessitated me hitting the momentary switch that turns on my in-line Airtex electric fuel pump. Doing this brought the engine back to life so to speak. When the car lost power it also made a faint moaning sound, which was very strange.

While driving the engine temp fluctuated between about 150 and 170 degrees on my aftermarket temp gauge. Does this sound like vapor lock or something else? I'm puzzled . Also, the car has been fully restored with all-new fuel line, a fresh filter, a rebuilt mechanical pump, etc. The engine is a 59L at about 251 cubic inches with a stock camshaft and a Stromberg 97 with stock jets.



Thanks!

- Craig