'99 Expedition fuel problem.
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From: Twentynine Palms, CA
'99 Expedition fuel problem
The volume test you did earlier with the bottles. Was that just taken off the fuel filter outlet? Airtex is usually a good pump. Only thing left I guess is the fuel pressure regulator if you feel like throwing a new one on. But as long as you're happy with the way it's running, that's all that really matters.
The main differences were the position of the tank and the amount of gas.
Tank bolted up and low gas = bad fuel pressure.
Tank lowered and low gas = low fuel pressure(~20psi), but able to run.
Tank bolted up, with added gas = low fuel pressure(~20psi), but able to run.
So it looks like with the Expedition up on the ramps and with a low fuel level, it was sucking air.
Now I need to finish filling the tank, replace the fuel pressure regulator and see if it continues to run, or if it gives me the same problem as I had to start with.
Oh yes, and check the pressure after installing a new regulator.
Right now it's got enough power to spin both tires, on a hard surface. I don't think that's too bad for as old as it is, as many miles as it has, and no idea at all when the last tune-up was done. Still work to be done to make sure everything is good. I'm just getting started.
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From: Twentynine Palms, CA
'99 Expedition fuel problem
OK, I replaced the fuel pressure regulator. Now at idle, I get 34 psi and when I rev the engine it goes up to 40 psi. Before it was at 18 to 20 psi, no matter what the throttle position was. Even disconnecting the vacuum didn't change it.
The Expedition may be good to go, I'll have to see. Now to register and license it, get it smogged and insured. Then start driving it to see what happens.
Thanks guys.
The Expedition may be good to go, I'll have to see. Now to register and license it, get it smogged and insured. Then start driving it to see what happens.
Thanks guys.
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Freshman User
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From: Twentynine Palms, CA
RE: '99 Expedition fuel problem - Solved
It is looking like my problem is solved.
The truck is now licensed, registered, smogged and insured.
My next step is to see where the gas gauge reads when it runs out of gas. (Must carry gas for when this happens. The reason I want to check this is, I have had vehicles before that have run out of gas before the gauge reads empty. Also, the gauge is being pegged past "Full" when I fill it up.
The truck runs well, smoothly and with no hesitation when accelerating. It is able to exceed 70 mph when going up some of the short on-ramps to the freeway here.
Any hints on what to do to increase the gas mileage? Besides not being a "lead foot." I have already installed a K&N air filter. What can be done with the exhaust system, without affecting the emissions?
Thanks again.
The truck is now licensed, registered, smogged and insured.
My next step is to see where the gas gauge reads when it runs out of gas. (Must carry gas for when this happens. The reason I want to check this is, I have had vehicles before that have run out of gas before the gauge reads empty. Also, the gauge is being pegged past "Full" when I fill it up.
The truck runs well, smoothly and with no hesitation when accelerating. It is able to exceed 70 mph when going up some of the short on-ramps to the freeway here.
Any hints on what to do to increase the gas mileage? Besides not being a "lead foot." I have already installed a K&N air filter. What can be done with the exhaust system, without affecting the emissions?
Thanks again.
Laughing Gas
Joined: Oct 2005
Posts: 1,226
Likes: 42
From: The OC
My 2000 only gets 12-15 mpg up or down hill. Looking at your location, to get good gas mileage, drive down to the Chiriaco Summit, turn around, and coast down. I bet the mileage will increase dramatically!
JK, glad you got it squared away!
JK, glad you got it squared away!
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From: Twentynine Palms, CA
Downhill gas mileage
I once drove a Lincoln down the Yucca grade, between Yucca Valley and Morongo Valley, I shifted it into neutral and let it coast. The car had a computer in it that would display average fuel mileage, instantaneous mileage, etc. During that coasting period it was getting 120 mpg.
That 12 mpg is what I used to get with a '60 F250 I had. It's engine was a '66 390 GT backed by a C6. 12 mpg, up hill, down hill, loaded or unloaded. As long as you kept your foot out of the carb. That truck also had an unknown top speed, the speedometer only went to 100 mph. I had the needle sitting half way between the 100 and 0 once, and wasn't at full throttle.
That 12 mpg is what I used to get with a '60 F250 I had. It's engine was a '66 390 GT backed by a C6. 12 mpg, up hill, down hill, loaded or unloaded. As long as you kept your foot out of the carb. That truck also had an unknown top speed, the speedometer only went to 100 mph. I had the needle sitting half way between the 100 and 0 once, and wasn't at full throttle.
Last edited by BigDave67; Sep 15, 2019 at 04:34 AM. Reason: add info
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TN_Explorer
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Aug 20, 2016 07:45 PM
