Relieving Fuel system pressure
Thread Starter
Instructor
Joined: Jun 2011
Posts: 205
Likes: 3
From: Great Mills Maryland
Relieving Fuel system pressure
I'm changing my fuel filter and part of the procedure is relieving fuel pressure. All I got for now is the Haynes manual. It says pull the fuse for the fuel pump and start engine until it stops due to lack of fuel. When I pull the fuse, the engine won't start. If I put the fuse back, the engine starts and as soon as I pull the fuse it shuts down. The car has been sitting for over 12 hours. I assume since it's been sitting so long the pressure has been relieved and wouldn't start without pump pressure. Should the engine run a little bit after loosing pump power?
I probably should have just changed the filter and not gone through this procedure since the cars been sitting. Thanks.
I probably should have just changed the filter and not gone through this procedure since the cars been sitting. Thanks.
Le Mans Master
Joined: Aug 2007
Posts: 8,735
Likes: 413
From: WV
If the car has been sitting I would have just opened the gas cap and released the pressure on the shraeder valve on the fuel rail.. This is the way I did my 89 and had very little pressure at the filter.. The method you discribe above is the proper one for these cars..Just wrap a towel around the filter as you unscrew the ends, this should handle the flow.....WW
Thread Starter
Instructor
Joined: Jun 2011
Posts: 205
Likes: 3
From: Great Mills Maryland
Thanks for the reply WW.
I guess another question would be, should the engine shutdown right away when the fuse is pulled? It's like I turned the ignition off. Would it run for a few seconds?
I guess another question would be, should the engine shutdown right away when the fuse is pulled? It's like I turned the ignition off. Would it run for a few seconds?
Le Mans Master
Joined: Mar 2004
Posts: 5,107
Likes: 171
From: Dublin CA
with WW7. Remove the gas cap. Also releave pressure at the Schrader valve. Some times the car will run for a few seconds after you pull the fuse.Just be ready when you take out the filter to loose some fuel. At least it will not be under 60 pounds of pressure
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