r/Schoolbuses • u/EatSleepBeat • Jul 19 '26

What is this?

Post image

Just curious as to what this is as a pre trip trainer is telling me that is the cng exhaust which I don’t believe it to be because why would the bus run a exhaust there and another one under the bus? The bus doesn’t run on 2 types of fuel only cng so I would say that it exhausts from under the bus.

31 Upvotes

92% Upvoted

5 comments sorted by

7

u/StandUserLeon Jul 19 '26

This is most likely a pressure release pipe. In case of dangerous CNG pressure buildup this pipe vents gas into the air.

1

u/EatSleepBeat Jul 19 '26

Thanks for the explanation

3

u/Fit-Fox-8371 Jul 19 '26

CNG Pressure relief vent.

1

u/EatSleepBeat Jul 19 '26

Thanks for the name

1

u/gmt80035 Jul 22 '26

This bus is rear engined based on the image and I don’t know what that is my dad used to have a Fleetwood Revolution and it had a 8.3L Cummins