What's the best way to release the fuel pressure before doing work on the fuel system?

Thanks.
(1999)

I might be wrong here, but I would start with taking the gas cap off. It might help if you told us what part of the fuel system you were trying to work on and/or what you are trying to do.

I am replacing a fuel injector. There is a valve beside injector# 8, however I am not sure if that is for pressure release. It has a needle inside which can be pressed and fuel does come out. The gas cap removal probably doesn't release the pressure ahead of the tank, but I would remove it anyway.

Thanks.

The valve you are speaking of does infact relieve fuel line pressure. When you take off the cap and press the needle inside that valve be sure to mop up the gas with a towel so it doesn't spill onto the engine.

Thanks....much appreciated.

What's the best way to release the fuel pressure before doing work on the fuel system?

Thanks.
(1999)
they also make a fuel preasure gauge..it screws onto that vlave you mentioned so you can releave the preasure..also the gas runs through a tube into a cup or container...(no mess)

really... i'd like one of those guages, where did you see it

really... i'd like one of those guages, where did you see it
all the auto stores should have them,,pep boys,autozone,advance auto,etc..there nice because the gauge tells you how much preasure you have in the fuel system..you can then release the preasure and have the gas flow neatly into a cup or container..

How do you relieve the fuel pressure before replacing the fuel pump in the tank? Do you just remove the gas cap?

How do you relieve the fuel pressure before replacing the fuel pump in the tank? Do you just remove the gas cap?
Find the fuel pump fuse and then pull it out, once done start the engine til it stalls from lack of fuel. Once this is done the pressure has been relieved.

Marc

Thanks Marc. But isn't it bad for these engines (and all fuel injection) to run out of gas that way? It sounds easy enough, I just don't want to hurt anything and not be able to start the car again.

Thanks Marc. But isn't it bad for these engines (and all fuel injection) to run out of gas that way? It sounds easy enough, I just don't want to hurt anything and not be able to start the car again.
It is bad to run the engines out of gas from lack of fuel in the tank. This enables the pump to suck up sediment and clogg the pump and filter or worse the debris could get past the filter and clog the injectors.

By pulling the fuse and just letting it idle out of gas (do not rev) all it does is shut down from lack of fuel and pressure.

Marc

Okay, thank you Marc. I was afraid I would never be able to start the car again if I let it run out of gas. Will I have any problems starting it up after the new pump is installed? Or should it just build up pressure by my turning the ignition and running the pump a few times?

Okay, thank you Marc. I was afraid I would never be able to start the car again if I let it run out of gas. Will I have any problems starting it up after the new pump is installed? Or should it just build up pressure by my turning the ignition and running the pump a few times?
You should have no issues. Just make sure to have enough gas in the tank as to reach and submerge the pump. Then turn your key to on (not start) wait a good 30-60 seconds during this time the fuel system should pressurize. Once this is done move ignition to start position and it should fire up no problem.


Just make sure to plug the fuel pump fuse back in . LOL

Marc

To release the fuel pressure, I opened the gas cap and took out the fuel pump fuse. Then when I went to start the car it made the loudest, most horrible bang, like a backfire. I thought for sure I blew up the engine. There was a little grey smoke under the hood when I opened it and a burning smell. But after I replaced the pump and let it pressure up a minute, the car started right up. So I don't think I hurt anything. Problem is, my slow-starting and dying at lights issues are still there. The fuel pump wasn't the cause.

To release the fuel pressure, I opened the gas cap and took out the fuel pump fuse. Then when I went to start the car it made the loudest, most horrible bang, like a backfire. I thought for sure I blew up the engine. There was a little grey smoke under the hood when I opened it and a burning smell. But after I replaced the pump and let it pressure up a minute, the car started right up. So I don't think I hurt anything. Problem is, my slow-starting and dying at lights issues are still there. The fuel pump wasn't the cause.
Why did you think your fuel pump was the cause of stalling and hard starts?

Have you checked your voltage from the alternator?
The slow starting could be a bad starter.
Also it sounds like it backfired out the throttlebody which could mean time for a tune up.

Marc

It was my mechanic that said the fuel pump was bad because he found it leaking pressure right after the car is turned off. I really think the hard-starting and stalling at lights is caused by the FPR, which he told me wasn't the cause because he did a pressure test at the FRP and it wasn't there. But it seems like it is the culprit for many people's similar problems. Should I try replacing it?

It was my mechanic that said the fuel pump was bad because he found it leaking pressure right after the car is turned off. I really think the hard-starting and stalling at lights is caused by the FPR, which he told me wasn't the cause because he did a pressure test at the FRP and it wasn't there. But it seems like it is the culprit for many people's similar problems. Should I try replacing it?
Hmmm........do you know what it costs? If it isn't expensive it might be worthwhile to change.

Also if you know someone with a vaccum tester you could have the FRP tested.Your local cap or auto zone might be able to help you out .

What this will do is create a vacuum on the FRP and it has a guage on it. If you place a vacuum on it and it stays then the FPR is good if it leaks then the diaphram is bad inside.

Marc