Relieving fuel pressure with no tools?

funkalicious · Mar 23, 2009

Replacing the fuel filter as part of a tuneup on a 1993 Mustang GT but do not have a hand vacuum pump or a fuel pressure gauge and cannot afford to buy them. How can I relieve the fuel system pressure without tools?

trbkrb · Mar 23, 2009

I press in the schrader valve fitting on the fuel rail under the hood and use an old towel wrapped around it to catch the fuel that comes out.

Good luck!

bubba-dough · Mar 23, 2009

Yep, me too....there is a shrader valve on the hard fuel line kind of behind the alternator. It probably has a black cap on it. Just press the valve core in like you are letting air out of a tire.

BE CAREFUL and wear safety glasses or better yet goggles. Gas in the eyes sux!!!!

Darkwriter77 · Mar 23, 2009

Do as mentioned above - depressing the Schraeder valve on the fuel rail with a rag covering it. Use your thumbnail, and thus you won't need to actually use any tools ... unless you count the rag as a tool.

FWIW, I've found it best to leave the gas cap on and not to open it before or during a fuel filter change. It seems to keep some suction on the fuel in the tank, so you don't spill as much when you go disconnecting the lines from the filter, otherwise it gushes out.

LiquidGT · Mar 23, 2009

I just let the car sit overnight before I change the fuel filter, the pressure is usually alleviated by then.

Tip: before you remove the old filter from the bracket put some vacuum caps on each end of the filter so the fuel wont spill down you arm when you're taking it out.

Strype · Mar 23, 2009

+1,2,3 and 4

mob · Mar 23, 2009

You dont have a screw-driver? Just takes a Philips head to take off 2 or 3 screws on the plastic trim in the trunk behind the drivers side taillight and unplug the inertia switch and run the car until it dies. You are still going to get fuel coming out of the lines so wear some safety glasses or goggles like stated previously.

strtrcr50 · Mar 23, 2009

Even easier. Take a 3/8 extension, put it on top of the inertia switch, and tap it with a hammer lightly. Or just pull the fuel pump relay and run it out of gas.

4G-KDMP · Mar 23, 2009

LiquidGT said:
I just let the car sit overnight before I change the fuel filter, the pressure is usually alleviated by then.

Tip: before you remove the old filter from the bracket put some vacuum caps on each end of the filter so the fuel wont spill down you arm when you're taking it out.

I use the same method!

Haus · Mar 24, 2009

mob said:
You dont have a screw-driver? Just takes a Philips head to take off 2 or 3 screws on the plastic trim in the trunk behind the drivers side taillight and unplug the inertia switch and run the car until it dies. You are still going to get fuel coming out of the lines so wear some safety glasses or goggles like stated previously.

thats how i do it too. works great

ID89GT · Mar 24, 2009

I usually just pull the fuel pump relay and run it till it dies, simple and easy to access.

funkalicious · Mar 24, 2009

Thanks for the help! Fuel filter will get changed today. And, yes, I do have a screwdriver

Shakerhood · Mar 25, 2009

4G-KDMP said:
I use the same method!

X3!

Relieving fuel pressure with no tools?

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