V7 Engine died

[Huzo]

Yes.

Was good while it lasted.

[Kev m]

I don't understand this stuff at all, but is there a sensor to read air intake temp, and if so, is the sensor properly placed and not where it can receive artificially hot air ?
I wondered if it's telling the ECU that there's insufficient oxygen then would it trim or out the fuel supply to a leaner setting ?
Is that utter fantasy ?

To explain the answer, the IAT IS some place that gets hot from the engine, but that's on purpose because the air at the intake does too. At least compared to just plain ambient.

[Chuck in Indiana]

Kev sez

I'm not sure I've ever heard of a verified case of vapor lock on an EFI motor.

Oh, yeah they have. The early V11 Sports. Guzzi had them at Daytona, and a bunch of us were putting ice down in the V to cool off the fuel line between demo rides. 

[Kev m]

Kev sez
Oh, yeah they have. The early V11 Sports. Guzzi had them at Daytona, and a bunch of us were putting ice down in the V to cool off the fuel line between demo rides. 

Interesting to hear thanks.

[darkstar1269]

Ambient 38C =102F, which isn't that hot, really. But maybe the fuel got hotter and it turned into vapor instead of liquid in your gas tank. That would cause a vapor lock.    After the gas cooled down some it was liquid again and all was back to normal.   

Agree, I have this happen on occasion here in Phoenix in the summer on days over 105F. The venting seems to be working fine as I can see the fumes coming from he tubes and can follow the lines back to the tank and see no crimping, but when I open he tank there is a bit of a pressure release, and all the running issues go away immediately. I now do this routinely when the bike has sat for a while in the summer sun, I consider it part of my V7's personality.

[SportsterDoc]

Ambient 38C =102F

+1

I rode my V7 II at temps up to 117 F (47 C) this summer without a hint of an issue.
Motoul 7100 10W-60 oil.

Vapor lock in the days of mechanical fuel pumps at the motor, drawing fuel from a tank was not uncommon.
An early fix was to recirculate fuel with that pump.
Now, with the need for 40+ PSI for EFI, an electric pump at/in the tank solves most vapor lock issues.

However, if the line from the pump to EFI/carb gets hot enough, vaporization/peculation can still be an issue.

In this case, inadequate venting, creating vacuum pressure in the tank seems to be a likely culprit.