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Old 03-08-2016
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Icon5 Fuel pump

Hi guys...I have a 94 Ranger 3.0, auto, XLT. I am getting ready to replace my leaky fuel tank filler neck and removing the bed to do it. My truck has 96K miles on it. I was considering replacing the fuel pump as well even though its working fine. I saw a vid on you tube where a guy had over 200K miles on his 96 and replaced the pump only due to a leaking fuel level float that was full of fuel.

My question is, about how long (mileage) are these pumps generally good for? I am a believer that if it aint broke, dont fix it. However, with the bed removed everything is wide open. What do you think, R&R or leave it alone.
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Old 03-08-2016
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My '94 4.0l has 350k, original pump still going strong, knock on wood
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Old 03-08-2016
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350K??? Thats great to hear! I guess those pumps go a long way. Thats a few bucks I can spend elsewhere...like shocks, air inlet duct from the MAF to the throttle body and a number of other things. I had in mind to restore this truck last year...I guess its about time I got started on it. I have had this truck since 96 or 97 and I sure do like it. I'd rather restore it than but a new truck of any kind.

Thanks for your reply
jd
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Old 03-08-2016
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Motorcraft parts are NOT cheap, but I have to say they do last.

Check out LMC truck for non-engine/trans parts, they have a lot of older Ranger parts available
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Old 03-09-2016
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Thanks Ron.most of the time we get what we pay for.sometimes not, but I have never had a problem with Motorcraft parts. I trust them too.

I think I am still going to pull the pump and the tank. That filler neck hose has been split for at least two years. Theres no telling whats inside of the tank. Maybe nothing judging by the way the truck runs. It runs strong, very reliable and has never failed the annual emissions check here in Tx. Just wish I could get better mileage though. I don't know if replacing that split hose will help or not but at least I wont lose anymore gas in a right turn. I am getting a constant 11 to 12 MPG.

I have LMC's site bookmarked. Sure do like some of those custom ranger grills but that and paint will come later after mechanical items are addressed.
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Old 03-09-2016
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11/12 MPG isn't right
If there are oversized tires on it then odometer will be off and if you are using that to calculate MPG it will be off as well, it would be low with taller tires.
Look at the drivers door label, it will have the stock tires size the speedo/odo is calibrated for.
'94 still used speedo cable so you can re-gear it for larger tires

When O2 sensors get older they will cause engine to run a little richer.
General life span for an O2 is 100k, so changing both O2 sensors might pay for themselves over the next 100k.

Pull a couple of spark plugs, very light brown on white electrode is clean burn, when it starts to get darker engine is running a little rich.
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Old 03-09-2016
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The wheels are stock cast aluminum and the same ones that were on the truck when I bought it. Last time I replaced the tires I put the same size back on. This truck is 100% stock and strictly a hiway vehicle.

At the last emission check I had I mentioned that my mileage was in the toilet. The tech said the same thing you said, time to replace the O2 sensors. I looked under the truck and found 2 of them but I'll be danged if I can figure out how to get to the connectors. They are buried high up between the firewall and the bell housing. I cant reach them from the bottom or top. I kinda hate to cut the wires to splice in new ones. I'm not sure I can even get the old ones out of the pipes with the rust and stuff, and I dont have a torch. I am not real happy about the idea of taking it to a shop and letting someone else do it.

I dont know if I could get any room by jacking up the body from the front bumper. That may give me a little more room to get my hand up there. Then I have to find out what the PNs are for the sensors...seems like theres a dozen numbers.

I have new plugs and 8MM wires on my list of things to do and the list keeps getting longer and longer. Still, it beats buying a new truck.

I wish I had done more routine maintenance on this thing then maybe I wouldnt have so much to do now. lol I checked the total mileage this morning...I am actually at 93K miles. It doesnt get a lot of use but when I need it, I need it.
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Old 03-10-2016
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"If you can't raise the bridge then lower the river"

See if you can unbolt the pipes from the exhaust manifolds and release a few exhaust brackets to lower pipes down to get to O2 sensors.

The wiring connectors are not on the O2 sensors, O2 sensors come with a 6" to 8" long pig tail that goes up and plugs into engine wiring harness.

O2 sensors can be tough to get out, but often not too bad.
My '94 4.0l was dropping MPG and I decided to put a couple of O2 sensors in, first one was tight but came out, second one was half unscrewed, lol, found my MPG drop.
Loose O2 sensor allows air to come in, O2 sees that air as Lean.
So I had a false lean and engine was running rich because of it.

Anyway, MPG went back up over the next few weeks, it doesn't happen instantly because computer has Long Term Fuel Trims that have to also change, which takes a few weeks.


This thread has some pictures and ideas on how to replace O2s: http://www.fordrangerforum.com/how-t...placement.html

Last edited by RonD; 03-10-2016 at 01:08 AM.
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Old 03-10-2016
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The last time I was under the truck I looked at the O2 sensors pretty close...they are tight but I didnt try to loosen them. Truthfully, I am more concerned about getting the new ones wired in rather than getting the old sensors out. There is just not a lot of room to move around under there.

I have seen some sensors that have the OEM type connector attached and others that are called "replacement sensors" that have those pigtails you mentioned. What brand did you use on your truck and what did you use for connectors. Surly they must be reasonably waterproof? Looks to me that they will be exposed to whatever weather is under the truck.

Excellent link you provided for me...thanks a million, I appreciate it. I see someone mentioned the tight space behind the engine on the right side too. I may have to use sensors with pigtails. I can see the connector on the left side, or I can touch it, but I cant do both! I am still looking for the one on the right side.

I used to have an 83 ford F100 step side with a 300 cu in straight six. There was so much room under the hood and truck that I could have lived under there! LOL I sure miss that old truck but was forced to get rid of it. It ran great but it just would not pass the stupid emissions check. There must have been a mile of plastic vacuum lines for emission controls under the hood. Those may have been the problem. In fact, that was the truck I traded in for my Ranger. In another two years my Ranger will be exempt from emission checks so I wont have to worry about that anymore.

I couldnt say which truck I like better...they both have their good points and bad points. I think I might have to lean towards the F100 just a shade though.
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Old 03-10-2016
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Never seen a stock or new O2 sensor that didn't have a pigtail, just to hot to have a reliable connection right on the O2 sensor.

Find the connector for both sides, then check that the new O2's plug into them.

Thread the old sensor's wire though a box end wrench of the correct size, or just cut the old sensor's wires off at the sensor and put the wrench on the sensor that way.
Tap on the wrench's end with a hammer to break sensor loose.

In '94 it can be metric or standard, find the right size wrench, new sensor will probably be metric.

I believe they were Bosch O2 sensors, that was OEM in '94 Rangers
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Old 03-11-2016
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Sorry, my terminology. Yes, I think all sensors come with a pigtail. What I meant to say was some come with the connector attached (assembly) and others have no connectors, just the wires to splice into the harness (pigtail) Sorry for the confusion.

I have been looking at the Bosch sensors. In my area they run around $40 each. They are advertised with 12.5 inch wires with the connector attached. I guess thats the correct length. I'll get around to buying a pair as soon as the weather clears up in my area...lots and lots of rain lately. My fuel filler neck assy showed up this morning. I am slowly gathering parts.

Thanks for your advice and input. I am certain I;ll have more questions as time passes.
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