lopez14

Is it okay if I leave my gas cap off over night? It won't harm my car in anyway? I heard that removing the gascap for at least 2 hours reduces the fuel pressure, is this true? I'm going to tap my fuel feed line tomorrow to get an extra fuel line. So will It be okay when I wake up in the morning?

Thanks!

s2cho

it wont do anything, you'll be fine. worst thing is it runs like a sub par tank of gas.

haywoodjablome

WOW! Listen to this kind of information and you'll grow hair on your palms.
Think about what the gas cap does. HINT: Emissions control - fuel vapor recovery.

AngryTurtle

WUT?

XBMAX

You'll be fine lol, fuel vapor recovery....

Saki GT

You will be fine. If you drive the car without the cap however, the CEL will light up because the emissions system will detect it is off.

Vanishing Point

Just bear in mind that ethanol based fuels are highly hydroscopic (attract moisture) so It will draw moisture into the tank. Otherwise no problem.

xviper

He's trying to bleed off fuel pressure so he can tap into the fuel line for another feed. Leaving the gas cap off won't do it. He needs to loosen the fuel damper on the fuel rail and soak up the fuel with a rag.
BTW, leaving the gas cap off only equalizes the pressure/vacuum in the tank with atmosphere. That takes less than a second. Leaving it off for 1 second or 1 hour or 1 day or 1 month does the same thing. You can drive the car as normal with the cap off. The car will drive as normal but with a CEL code P1456.

jeggy

he can also remove pressure by removing the fuel pump fuse and cranking the engine.

s2cho

all gas tanks have a metal flap which does not create a solid seal but will keep the gas from going bad under reasonable amounts of time. HINT: the amount of vapor coming out the tank will be determined by the pressure inside the tank. so you have hairy palms huh? "WOW! Listen to this kind of information and you'll grow hair on your palms." your info is bad not mine.