Relieving Fuel Pressure
#1
Relieving Fuel Pressure
I have a 91 4runner. I looked up "Relieving fuel system pressure" in my Chilton's manual and was surprised at what I read. It says to wrap a clean towel around the union bolt at the fuel delivery rail and slowly loosen the bolt. Isn't this really dangerous?
I was thinking about just disconnecting the fuel pump power or removing the fuse and cranking the engine a few times. I noticed that there's an EFI relay as well as an EFI fuse. Does the relay only control the fuel pump and not the injectors?
Thanks for the help.
I was thinking about just disconnecting the fuel pump power or removing the fuse and cranking the engine a few times. I noticed that there's an EFI relay as well as an EFI fuse. Does the relay only control the fuel pump and not the injectors?
Thanks for the help.
#2
Originally Posted by Rahimatron
I have a 91 4runner. I looked up "Relieving fuel system pressure" in my Chilton's manual and was surprised at what I read. It says to wrap a clean towel around the union bolt at the fuel delivery rail and slowly loosen the bolt. Isn't this really dangerous?
#3
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I just replaced my engine and when I took the fuel line off, only a couple of drips came out. Nothing to worrie about in my opinion. Maybe first let the vehicle sit for a while, so most of the pressure is gone.
#4
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On my '93 there is a small access panel on the floor under the rear passenger seat. If you unscrew that there is a connection for the fuel pump. Undo the connection and run the engine until it quits and the fuel pressure is relieved.
#5
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I just replaced my fuel filter and the Hayes manual suggested what you said - remove the fuel pump fuse, start the engine, and then wait till it shuts down from lack of fuel.
My motor wouldn't turn over at all without the fuse, but I cranked it a few times and figured I was good to go. No problems removing the fuel filter.
I'm no professional wrench though
My motor wouldn't turn over at all without the fuse, but I cranked it a few times and figured I was good to go. No problems removing the fuel filter.
I'm no professional wrench though
#7
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Originally Posted by Schuey2002
So,uhm.. taking off your gas cap won't relieve any pressure on the system??
When I want to bleed the system off, I let it sit for a while, then crack the banjo bolt at the end of the fuel rail. A few drops come out and the pressure is relieved.
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#8
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Pretty sure he is talking about pressure in the fuel lines created by the fuel pump. When the vehicle is shut down there is still a little fuel in the lines, etc.
Does that make sense?
Does that make sense?
#11
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Originally Posted by lee
why must one do this? forgive my ignorance
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