01 gas tank in an 87
CF Veteran
Joined: Mar 2011
Posts: 2,570
Likes: 4
From: California
Year: 1992
Model: Cherokee
Engine: 4.0 HO
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Joined: Sep 2010
Posts: 34,088
Likes: 257
From: Lantana, Fl
Year: 1996
Model: Cherokee (XJ)
Engine: 4.Slow
Originally Posted by odgreen89on35s
This thread..... Is one of the "special" threads.
Well, hmm... I see this a bit differently I guess.
The rail-mounted regulator should hold the pressure well within the limits of the factory fuel lines. That OEM regulator is still in place, working pressure has not changed, assuming I'm reading right.
If that regulator fails, the newer pump ***'y itself is regulated to roughly 50#. Edit: Well, fiddlesticks. I can't type an abbreviation for "assembly" without being assumed naughty lol.
So we're possibly in a better position safety-wise if the rail regulator should fail, being limited to 50 PSI by the new pump assembly instead of whatever pressure the '87 pump could generate before stalling out. Anyone want to plug the return on an 87 pump and see what it can do?
Even the crummy old rubber fuel line we ran in 5# carb days was rated 50# max working pressure with burst strength much higher , surely a fuel injected 87 used something better. Not that it should matter as the system pressure is unchanged from OEM. The lines don't know anything has changed.
That said, I'd still replace any rubber (or neoprene) fuel lines with something better. Reason why? Because they're old. Even at stock pressure, 25 years is beyond their design life.
The rail-mounted regulator should hold the pressure well within the limits of the factory fuel lines. That OEM regulator is still in place, working pressure has not changed, assuming I'm reading right.
If that regulator fails, the newer pump ***'y itself is regulated to roughly 50#. Edit: Well, fiddlesticks. I can't type an abbreviation for "assembly" without being assumed naughty lol.
So we're possibly in a better position safety-wise if the rail regulator should fail, being limited to 50 PSI by the new pump assembly instead of whatever pressure the '87 pump could generate before stalling out. Anyone want to plug the return on an 87 pump and see what it can do?
Even the crummy old rubber fuel line we ran in 5# carb days was rated 50# max working pressure with burst strength much higher , surely a fuel injected 87 used something better. Not that it should matter as the system pressure is unchanged from OEM. The lines don't know anything has changed.
That said, I'd still replace any rubber (or neoprene) fuel lines with something better. Reason why? Because they're old. Even at stock pressure, 25 years is beyond their design life.
Last edited by Radi; Sep 29, 2012 at 04:12 AM.
CF Veteran
Joined: Apr 2008
Posts: 7,661
Likes: 15
From: Smiths Station, Al
Year: 87
Model: Wagoneer
Engine: 4.0 I6
Originally Posted by Rustydog555
Love the mods in here wish one on em knew something
First warning.
Many people here with umpteen years of exp. if serious offroad told me something wasnt safe i would listen.
Thread Starter
Seasoned Member
Joined: Dec 2010
Posts: 251
Likes: 0
From: Orlando
Year: 1988
Model: Cherokee
Engine: 4.0
Originally Posted by Radi
Well, hmm... I see this a bit differently I guess.
The rail-mounted regulator should hold the pressure well within the limits of the factory fuel lines. That OEM regulator is still in place, working pressure has not changed, assuming I'm reading right.
If that regulator fails, the newer pump ***'y itself is regulated to roughly 50#. Edit: Well, fiddlesticks. I can't type an abbreviation for "assembly" without being assumed naughty lol.
So we're possibly in a better position safety-wise if the rail regulator should fail, being limited to 50 PSI by the new pump assembly instead of whatever pressure the '87 pump could generate before stalling out. Anyone want to plug the return on an 87 pump and see what it can do?
Even the crummy old rubber fuel line we ran in 5# carb days was rated 50# max working pressure with burst strength much higher , surely a fuel injected 87 used something better. Not that it should matter as the system pressure is unchanged from OEM. The lines don't know anything has changed.
That said, I'd still replace any rubber (or neoprene) fuel lines with something better. Reason why? Because they're old. Even at stock pressure, 25 years is beyond their design life.
The rail-mounted regulator should hold the pressure well within the limits of the factory fuel lines. That OEM regulator is still in place, working pressure has not changed, assuming I'm reading right.
If that regulator fails, the newer pump ***'y itself is regulated to roughly 50#. Edit: Well, fiddlesticks. I can't type an abbreviation for "assembly" without being assumed naughty lol.
So we're possibly in a better position safety-wise if the rail regulator should fail, being limited to 50 PSI by the new pump assembly instead of whatever pressure the '87 pump could generate before stalling out. Anyone want to plug the return on an 87 pump and see what it can do?
Even the crummy old rubber fuel line we ran in 5# carb days was rated 50# max working pressure with burst strength much higher , surely a fuel injected 87 used something better. Not that it should matter as the system pressure is unchanged from OEM. The lines don't know anything has changed.
That said, I'd still replace any rubber (or neoprene) fuel lines with something better. Reason why? Because they're old. Even at stock pressure, 25 years is beyond their design life.
Thread Starter
Seasoned Member
Joined: Dec 2010
Posts: 251
Likes: 0
From: Orlando
Year: 1988
Model: Cherokee
Engine: 4.0
Originally Posted by XJ Stryker
We know enough to remove users like yourself.
First warning.
Many people here with umpteen years of exp. if serious offroad told me something wasnt safe i would listen.
CF Veteran
Joined: Nov 2010
Posts: 15,581
Likes: 8
From: some small town oregon
Year: 1989
Model: Cherokee
Engine: 4.0
Originally Posted by odgreen89on35s
This thread..... Is one of the "special" threads.
Originally Posted by Rustydog555
Love the mods in here wish one on em knew something
I was referring as a special thread due to the many people giving you wrong info
Senior Member

Joined: May 2012
Posts: 925
Likes: 5
From: Fort Erie, CANADA
Year: 1987
Model: Cherokee
Engine: 4.0
This is really unfair. You asked something like "Tell me why I can't do something".
Firstly, that kind of question is ridiculous. You can do anything you want. People responded assuming your bad question was really "Should I do this..." so they gave you their advice. Most of us, unless we keep $100 bills in their front pockets, wouldn't swap a tank with the pump in the top instead of the side mounted style, pay more for the assembly the has the regulator combined etc etc. If this was junkyard wars, that's fine but people are giving you advice based on what they would do. Most of us on here ask questions before we start a job or if we are looking at parts for sale etc so we don't make a bad situation worse. Who knows what your technical ability is, if you have a pressure gauge to measure it, have you done it before etc.
You can put the tank on the front bumper or inside the cab if you want. Do whatever you want.
Secondly, a "Sorry" never hurts either.
Firstly, that kind of question is ridiculous. You can do anything you want. People responded assuming your bad question was really "Should I do this..." so they gave you their advice. Most of us, unless we keep $100 bills in their front pockets, wouldn't swap a tank with the pump in the top instead of the side mounted style, pay more for the assembly the has the regulator combined etc etc. If this was junkyard wars, that's fine but people are giving you advice based on what they would do. Most of us on here ask questions before we start a job or if we are looking at parts for sale etc so we don't make a bad situation worse. Who knows what your technical ability is, if you have a pressure gauge to measure it, have you done it before etc.
You can put the tank on the front bumper or inside the cab if you want. Do whatever you want.

Secondly, a "Sorry" never hurts either.


