Question about 1989 Jeep Comanche

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1991 Jeep Comanche

I have a 91 Comanche that had a leaking fuel tank. I replaced the tank,and as long as I had the tank out, I replaced the fuel pump and fuel filter. I now have trouble with engine,seems to be starving for fuel in 2nd, and 3rd gear. Any ideas out there?

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Make shour that the fuel pump is pumping enough but if it is check you lines leaving you pump for a clog push air thru them the blead the system so that you have fuel up at the engine.

Posted on Feb 11, 2009

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My 1991 jeep comanche sputters when in 3rd at bout 3 grand.does it have a revlimiter?


no , but if in limp home mode (ECU) yes.

if the cel is out , running its not in limphome.

my guess? car was never tuned up, in last 60,000 miles or ever.

i had a 91 Comanche and ran it 250,000 miles, (5speed)

classic fails:

the bottom exh tube under my bell housing , the clamp breaks every 6 months ( i welded up a life time clamp) this allowed the

exhaust down tube, to flex and whole exhaust to act as silly pendulum. this put stress on my SST headers causing crackes.

this in turn let fresh air suck in to the header and slam the oxygen sensor to the rails, (car ran rich a s pig and could not keeps spark plugs clean.)

also the 91 has recalls on the CKP sensor. causing misfires.

its on the top left top of bell housing, very hard to see.

there is no scan tools for this Renix system. so can pull scan DTC codes, is your CEL glowing running?, BINGO.

my 99 Cherokee had none of this (well except sloshing fuel starves the fuel pump at 1/4 tank, design flaw.)



sputter is misfire.

the 91 does not have misfire detection in the ECU,

not till 1996.

so you are the detector.

do a full tune up.

then look at spark tips.

are the cream color or black.????????????

if black, post back.

i still miss and loved my Comanche. (im 1/8 real Comanche blood)

Nov 10, 2013 | 1991 Jeep Comanche

1 Answer

I have a 1991 jeep comanche, straight 6. It will turn over and run for a while but when you turn it off the fuel pump will not engage again and motor won't start. what could it be?


Its a 91,,,,20 years of use on that fuel pump, If it is not getting gas than its the fuel pump, You could try replaceing the fuel filter,And have some one do a fuel pressure test,But its most likely the pump died and yes some will pump a little and than quit.How many miles on it? thats how many miles on that pump also.

Mar 07, 2011 | 1991 Jeep Comanche

1 Answer

What is the best way to take off a gas tank on a 91 jeep comanche to replace it, and also how do you get the fuel pump out of the gas tank?


Put the truck on service ramps or a lift. Pump out any fuel in the tank. Remove the plastic cover from the tank straps, 10mm socket. Unhook filler and vent hoses. Unhook fuel lines, electrical wires and vacuum lines at the T connector.
Support the tank with a jack and loosen the strap nuts with a 15 mm wrench, then lift the strap hooks out of the notch in the frame. Once loose, work the tank out. Dropping the drive shaft would make it easier.

Jan 31, 2011 | 1991 Jeep Comanche

1 Answer

I have a maint reqd light on in a 91 jeep comanche. how can i diagnose this problem?


Put an OBD1 scanner on it and clear the maint light. Comes on at 60,000 and other mileage as a reminder.

Apr 30, 2010 | 1991 Jeep Comanche

1 Answer

My jeep comanche does not get fuel


Sounds like a fuel pump dude. Can be hard to get to for replacement. May just be a wiring issue which can be tested. Check the fuses. Chev has issues with burned out fuses to the fuel pump.

Oct 15, 2009 | 1991 Jeep Comanche

1 Answer

91 CHEROKEE FUEL PUMP


Pretty sure you don't need to drop the tank on those. I usually take the tank down as "routine" to prevent dirt etc from falling into it while working and to check contents of tank for rust & water that can & will damage new pump. A bit of extra work, but many times well worth the effort! Tank r&r isn't really such a difficult job.
Good Luck

Apr 03, 2009 | 1991 Jeep Cherokee Limited

1 Answer

1987 jeep comanche has new fuel pump,won't start


The pump is in the fuel tank. You need to replace the fuel pump. it is dying, and will sooner or later die all together. Have you changed the fuel filter????? Also check that out!!!!

Feb 12, 2009 | 1987 Jeep Comanche

1 Answer

1991 jeep comanche brakes


check under dash for leaking vaccum switch. usually manufacturers use vac switches to release the e-brake automatically when applying the brake.

Jul 17, 2008 | 1991 Jeep Comanche

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