Fuel problems need help.
- Thread starter XJHOX
- Start date
hintonsooner
NAXJA Forum User
On all 90 & 91 xjs DC went with an automatic fuel shut off valve that is actuated by any body roll over 30 degrees. They used this safety system to get a higher safety rating from the insurance industry, but after 91 they realized it wasnt even being considered. The only way to disable this switch is to take your xj to a certified jeep repair center and they will electronically disable the switches function in the computer. Best of all this service is free, so all you'd need to do is stop by and request the service. It only takes about one minute.
mark91xjbeef
NAXJA Forum User
- Location
- El Cajon Ca.
i went to a dealer todat and they said they new nothing of this cut off switch. the guy went around and asked everyone in the service dept. and nobody knew anything. is it it the 91 fsm or is their a recall bulletin i can show them.
hintonsooner
NAXJA Forum User
i went to a dealer todat and they said they new nothing of this cut off switch. the guy went around and asked everyone in the service dept. and nobody knew anything. is it it the 91 fsm or is their a recall bulletin i can show them.
:bs: Dude, I'm sorry you went to the dealer and asked about that. That was along the lines of sending someone to the parts store for a bottle of blinker fluid or a fender gasket. I didn't realize how convincing it was until my wife read it and believed it. Then she told me how cruel and mean it was. So I sent her to the store for a yard of flight line. No really, I'm just kidding. Sorry for any embarrassment.:looser:
:bs: Dude, I'm sorry you went to the dealer and asked about that. That was along the lines of sending someone to the parts store for a bottle of blinker fluid or a fender gasket. I didn't realize how convincing it was until my wife read it and believed it. Then she told me how cruel and mean it was. So I sent her to the store for a yard of flight line. No really, I'm just kidding. Sorry for any embarrassment.:looser:
- Location
- Terra Firma
hintonsooner said:
NOT FUNNY
Really. Not even a little bit funny. People visit these forums for help, not to get jerked around by "friends."
mark91xjbeef
NAXJA Forum User
- Location
- El Cajon Ca.
the reason i did it was because if i take a turn at high speed or ride the side of a dune sometimes the power from the engine stops. i think it is most likely fluid starviation to the tranny but was open to other options. thanks for no help
- Location
- Terra Firma
mark91xjbeef said:
The engine should continue to produce power until it dies from fuel starvation. If the engine is running but you're not getting power to the wheels, then I'd support your guess that it's tranny-related.
MJmk
NAXJA Forum User
- Location
- Olympic Penninsula
XJHOX said:
Is this something that just started, or started after a fuel pump replacement? Any damage to the bottom of the tank? I could see this happening if you were really low on fuel, but it's kind of odd it does it only when tilted to the right. With the pump at the bottom center of the tank, it seems it would do it when tilted to the left also.
Lucas
NAXJA Forum User
- Location
- ZOO YORK CITY
hintonsooner said:
That was WRONG. I believed it. There is nothing even remotely indicative of a joke in there.
As for the problem, has it always done this or did it just recently start?
hintonsooner
NAXJA Forum User
Again, I'm sorry for the smart ass reply, but I'm new to this forum and all the other forums that I've been to have been informative yet light hearted. Seeing as how this isn't quite the brain surgury forum or the explosive ordinance disposal help line I guess I didn't see the harm in a little ribbing of "friends", afterall there was no harm done. Anyway, my apologies to the offended and it's strictly business from here on out.
satan
NAXJA Forum User
- Location
- Lakewood, CO USA
The fuel starvations is not too uncommon there can be several issues.
Probably most common is issues with the pick-up:
-1- there's supposed to be a pre-filter sock on the intake of the in-tank fuel pump - that pre-filter assembly often drops off into the tank after many years of constant vibration (in late '88 the fuel pump's intake changed from a hard ceramic to a more pliant rubber over steel design - well, those age and soften allowing the pre-filter to drop-off or losen)
-2- the pick-up is no longer in the "baffle", there's a small baffle in the tank to help with starvation (really you'll probably have this issue when cornereing left at pretty good speeds too!) - inside the tank, the return line is capped with a small rubber cone that stabilizes the rest of the stuff hanging in there (among other things) - that rubber can degrade and allow the pick-up itself to deform, though I've only seen this once on an XJ run with MTBE as a fuel additive.
The other issue is that the pick-up is centered latterally in the tank - sufficient force will draw fuel from that area (I mean the pick-up doesn't follow the fuel if the pump cavitates you'll see a stumble or the stall you discuss) - typically these symptoms show with roughly 7 gallons or less in the tank - your operating g-load/roll angle may be more severe, but ... Y'kinda do have to live in the physical world on some things...
Next time you're low on fuel (for me that's BELOW 1/4 on the gauge), remove the fuel-tank's sender/pump assy (ring is located on the top-front face of the tank - no need to lower the tank, but be sure that everything is celan so you're not filling the tank with sand or whatever) - inspect to see that your pre-filter is inplace and sealing to the pump intake (it should look like a dirty black sock sticking out at a right angle below the pump) - also look for the rubber cone on the return line... I'll wager that something is awry there...
If you end-up purchasing a new pre-filer, they'll oftne not seal/fit tightly to your pump's intake - since youv'e most likely got the rubber over steel intake on the pump you can use a steel guitar string to machine a groove into the rubber intake (I usually go about 1/8" from the intake end) and fit a 9/16" diameter x1/16" O-ring onto the pumps' intake then you'll find that the pre-filter fits and seals quite well indeed. (BTW there's kinda of a "key" cast into the outside diameter of the pre-filter's attachment to the pump so that you'll be able to get it installed in the correct orientation.)
On another note - is there any chanse that you have some contamination in your tank (fouling, water, etc)? And you have verified that your fuel filter is happy..?
As for the hintonsooner deal - that goes beyond sad - he should probably consider changing his user ID and starting over with his new commitment to not be an as$. There was no call for that - I hope one day to return the 'favor' to him or his wife when she's in real need of assistance.
Probably most common is issues with the pick-up:
-1- there's supposed to be a pre-filter sock on the intake of the in-tank fuel pump - that pre-filter assembly often drops off into the tank after many years of constant vibration (in late '88 the fuel pump's intake changed from a hard ceramic to a more pliant rubber over steel design - well, those age and soften allowing the pre-filter to drop-off or losen)
-2- the pick-up is no longer in the "baffle", there's a small baffle in the tank to help with starvation (really you'll probably have this issue when cornereing left at pretty good speeds too!) - inside the tank, the return line is capped with a small rubber cone that stabilizes the rest of the stuff hanging in there (among other things) - that rubber can degrade and allow the pick-up itself to deform, though I've only seen this once on an XJ run with MTBE as a fuel additive.
The other issue is that the pick-up is centered latterally in the tank - sufficient force will draw fuel from that area (I mean the pick-up doesn't follow the fuel if the pump cavitates you'll see a stumble or the stall you discuss) - typically these symptoms show with roughly 7 gallons or less in the tank - your operating g-load/roll angle may be more severe, but ... Y'kinda do have to live in the physical world on some things...
Next time you're low on fuel (for me that's BELOW 1/4 on the gauge), remove the fuel-tank's sender/pump assy (ring is located on the top-front face of the tank - no need to lower the tank, but be sure that everything is celan so you're not filling the tank with sand or whatever) - inspect to see that your pre-filter is inplace and sealing to the pump intake (it should look like a dirty black sock sticking out at a right angle below the pump) - also look for the rubber cone on the return line... I'll wager that something is awry there...
If you end-up purchasing a new pre-filer, they'll oftne not seal/fit tightly to your pump's intake - since youv'e most likely got the rubber over steel intake on the pump you can use a steel guitar string to machine a groove into the rubber intake (I usually go about 1/8" from the intake end) and fit a 9/16" diameter x1/16" O-ring onto the pumps' intake then you'll find that the pre-filter fits and seals quite well indeed. (BTW there's kinda of a "key" cast into the outside diameter of the pre-filter's attachment to the pump so that you'll be able to get it installed in the correct orientation.)
On another note - is there any chanse that you have some contamination in your tank (fouling, water, etc)? And you have verified that your fuel filter is happy..?
As for the hintonsooner deal - that goes beyond sad - he should probably consider changing his user ID and starting over with his new commitment to not be an as$. There was no call for that - I hope one day to return the 'favor' to him or his wife when she's in real need of assistance.
