At what temperature does gas start to evaporate, well Vapor Lock? 100 degrees 90? I need to know a number so I can determine if that is the issue I've heard about 175 degrees and the vehicle starts to vapor lock, I don't know if that's true seems too hot I think less if anyone knows please let me know.
Update:I have a spacer that rejects heat, I'm checking the temps with a laser or I.R temperature Thermometer gun. I use it to check the temp on the headers, so I used it to check my lines fuel filter, Fuel regulator and etc. Little back round my fuel pressure is dropping when the car starts (it should stay at 6 psi) with in 4-5 minutes the pressure drops to 1 psi. so I'm checking if it's air in the lines which I determined its not, next I'm looking at a bad pump or vapor lock or could be both. So I'm going to list my highest temp reading for the Lines, filter and regulator and you tell me if it's way to hot so vapor lock is a definite.
Fuel Filter= 134.3 F
Fuel line from filter to regulator= 174.8 F
Fuel pressure regulator= 128.0 F
Fuel Line Regulator to Carb= 149.0 F
That seems pretty hot, is that hot enough for a vapor lock? I'm thinking yes but I need to know so if not sure could you please hit me up with a source online that talks about the degrees where fuel
Answers & Comments
Verified answer
this something haven't herd of in 40 years . this happen with carabator cars with hot motors in SUMMER an low Fuel pump presser an or clog Fuel filter . on some cars had a thing called cool can . with Fuel line an ice would put in . an happen more in race cares then street / , race cars would get up to 500 degrees under hood street cars gets aron 250 t0 300 under hood so don,t know exact temp but seen it gas boiling in carbs an in lines .hope helps
Okay if your fuel line sits too close to the engine manifolds either intake or exhaust the heat from the motor will boil the gas in the line or fuel bowls on a carborated ride. Then you get a ride that you have to push. The trick is a phenolic spacer between the carb and the intake manifold that rejects the heat transfer. Another quick fix is an "ice box" that your fuel line goes though under the hood. The old 5.0 Mustang motors have a phenolic spacer between the upper and lower intake pieces. You can also get thermo tape you wrap your fuel line and exhaust in to keep the heat out or in as you need. You never gave an application so I am not going to guess what you drive.