I'm trying to figure out why my motor is hesitating. Should gas tank vent be open while running? Also, should the motor turn completely over when I'm doing a compression test at the plugs?
Howdy, HE.<br /><br />Yes, keep the vent open when running.<br /><br />When doing a compression test you should turn the engine over four or five times for each cylinder.<br /><br />Good luck.
The purpose of the vent in addition to what ST said is that it allows air to replace the used gas and keeps a vacuum in the gas tamk from happening. Without it open when running the motor will eventually stop.
