Relieving fuel pressure - big over sight
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Joined: Jun 2007
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Relieving fuel pressure - big over sight
Is there another way to relieve the fuel pressure when the engine's in pieces? I know its kinda a big over sight but I completely spaced it and now not sure how to go about it 
I'm thinking of slowly loosening the nuts on the fuel lines just enough to start letting pressure out. Would this be advisable? Im changing out the water pump and removing all things emission related on the 85. Thanks for any help!
I'm thinking of slowly loosening the nuts on the fuel lines just enough to start letting pressure out. Would this be advisable? Im changing out the water pump and removing all things emission related on the 85. Thanks for any help!
Supporting Vendor
Joined: Mar 2008
Posts: 1,762
Likes: 14
From: Cumming Ga
Is there another way to relieve the fuel pressure when the engine's in pieces? I know its kinda a big over sight but I completely spaced it and now not sure how to go about it I'm thinking of slowly loosening the nuts on the fuel lines just enough to start letting pressure out. Would this be advisable? Im changing out the water pump and removing all things emission related on the 85. Thanks for any help!
I'm thinking of slowly loosening the nuts on the fuel lines just enough to start letting pressure out. Would this be advisable? Im changing out the water pump and removing all things emission related on the 85. Thanks for any help!do it over a pan, make sure you get the nose up higher than the tank. then remove the lines from the rail and cap them,,
Last edited by FICINJECTORS; Oct 3, 2008 at 10:15 PM.
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Well according to the haynes manual the fuel lines have to be disconnected to remove the ac compressor bracket when changing the water pump. Is there another way to do this without removing the feull line? I forgot to relieve the pressure before taking apart so that's why I'm asking.
Le Mans Master
Joined: May 2007
Posts: 8,448
Likes: 27
From: Valparaiso
i've just did the injector swap (3 days ago)
and i did relieve the pressure opening the gas cap...
when i unhooked the fuel lines,it dropped a bit of gas,nothing
that a rag can't absorv,too little,nothing that will leave your engine
all wet in gas,i put them back together and that was it.-
No big deal bout this ...
and i did relieve the pressure opening the gas cap...
when i unhooked the fuel lines,it dropped a bit of gas,nothing
that a rag can't absorv,too little,nothing that will leave your engine
all wet in gas,i put them back together and that was it.-
No big deal bout this ...
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Supporting Vendor
Joined: Mar 2008
Posts: 1,762
Likes: 14
From: Cumming Ga
Well according to the haynes manual the fuel lines have to be disconnected to remove the ac compressor bracket when changing the water pump. Is there another way to do this without removing the feull line? I forgot to relieve the pressure before taking apart so that's why I'm asking.
Last edited by FICINJECTORS; Oct 4, 2008 at 07:54 AM.
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Joined: May 2007
Posts: 82
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From: LA California
I’m here to tell you that you are absolutely wrong about this under certain conditions and that your advice has the potential to cause a very serious fire hazard.
If the fuel tank is subject to an increase in temperature such as being exposed to the sun in the afternoon and the fuel cap is on, pressure will build in the tank. If the fuel lines are disconnected and not unconditionally capped the pressure will result in a fuel discharge.
It is a very big deal!
If the fuel tank is subject to an increase in temperature such as being exposed to the sun in the afternoon and the fuel cap is on, pressure will build in the tank. If the fuel lines are disconnected and not unconditionally capped the pressure will result in a fuel discharge.
It is a very big deal!
Safety Car
Joined: May 2002
Posts: 4,010
Likes: 26
From: Somewhere nowhere
I never capped the fuel lines. I just made sure they were higher than the engine. Never had a problem.
Let's say I wanted to cap them.
what size caps should I buy?
are they metric, or SAE?
Let's say I wanted to cap them.
what size caps should I buy?
are they metric, or SAE?
Le Mans Master
Joined: May 2007
Posts: 8,448
Likes: 27
From: Valparaiso
I’m here to tell you that you are absolutely wrong about this under certain conditions and that your advice has the potential to cause a very serious fire hazard.
If the fuel tank is subject to an increase in temperature such as being exposed to the sun in the afternoon and the fuel cap is on, pressure will build in the tank. If the fuel lines are disconnected and not unconditionally capped the pressure will result in a fuel discharge.
It is a very big deal!
If the fuel tank is subject to an increase in temperature such as being exposed to the sun in the afternoon and the fuel cap is on, pressure will build in the tank. If the fuel lines are disconnected and not unconditionally capped the pressure will result in a fuel discharge.
It is a very big deal!
How it's gonna catch fire ?
I told him before,better remove the fuel cap,and then follow FICINJECTORS advice,you should have no problem,of course it can cause a fuel discharge but ,not an explosion.-
Melting Slicks
Joined: Feb 2008
Posts: 3,286
Likes: 6
From: Palm Beach
Please explain to us what was wrong with Jon's advice. He said to leave the cap off.
I’m here to tell you that you are absolutely wrong about this under certain conditions and that your advice has the potential to cause a very serious fire hazard.
If the fuel tank is subject to an increase in temperature such as being exposed to the sun in the afternoon and the fuel cap is on, pressure will build in the tank. If the fuel lines are disconnected and not unconditionally capped the pressure will result in a fuel discharge.
It is a very big deal!
If the fuel tank is subject to an increase in temperature such as being exposed to the sun in the afternoon and the fuel cap is on, pressure will build in the tank. If the fuel lines are disconnected and not unconditionally capped the pressure will result in a fuel discharge.
It is a very big deal!
Supporting Vendor
Joined: Mar 2008
Posts: 1,762
Likes: 14
From: Cumming Ga
I don't know exactly the size.. i have made a set of caps from a old fuel rail Its now a tool I use when working on TPI. I cut the tubes leaving the fittings and put vac plugs over the pipe ends.. did it like 20 yrs ago. You can always raise the lines but being safety minded i do not leave fuel lines open, too many cats. Most people don't have a problem untill its to late.
Last edited by FICINJECTORS; Oct 4, 2008 at 06:32 PM.
Supporting Vendor
Joined: Mar 2008
Posts: 1,762
Likes: 14
From: Cumming Ga
I’m here to tell you that you are absolutely wrong about this under certain conditions and that your advice has the potential to cause a very serious fire hazard.
If the fuel tank is subject to an increase in temperature such as being exposed to the sun in the afternoon and the fuel cap is on, pressure will build in the tank. If the fuel lines are disconnected and not unconditionally capped the pressure will result in a fuel discharge.
It is a very big deal!
If the fuel tank is subject to an increase in temperature such as being exposed to the sun in the afternoon and the fuel cap is on, pressure will build in the tank. If the fuel lines are disconnected and not unconditionally capped the pressure will result in a fuel discharge.
It is a very big deal!
Burning Brakes
Joined: Feb 2008
Posts: 988
Likes: 7
From: Sarasota Fl
5/16" vacuum caps (readily available at auto parts stores) have been on my fuel lines for a month or more with no leaks (battery is disconnected and gas cap is off) and there was no fuel leaked when I unscrewed the lines from the rails, BUT, there was fuel still in the rails.
