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fuel sending unit


xtreameracer

Active Member
Joined
Oct 15, 2009
Messages
28
City
wild and wonderful wv
Vehicle Year
1988 stx highri
Transmission
Manual
i am getting ready to put a 92 2wd cab on a 88 4wd, will the fuel sending unit need to be changed or will the 88 trucks work with the 92 wirring.
thanks
Brandon
 
BUMP, basically what he is asking: is the resistance of the sending unit on the 88 is similar to the '92 so he can have the "correct" fuel reading on the '92 gauge cluster.(using a '88 sender)
 
correct !! also were the 89+ only use one fuel pump will the two pumps on the 88 still work or will i have to change the all the fuel systems parts.
 
No, ou just have to wait until someone (like me) comes along who actually KNOWS the answer, because if someone gave you an answer they "think" they know I wouldfirst have to take the time to administer some Special High Intensity Training (usually mentioned under the acronym "S.H.I.T.") to remind people to not give incorrect "Guesses" as answers.

That's how misinformation propagates.

Now, Yes, you will have a problem I've been running a gen2 fuel system
in my Gen1 truck for years. THE issue is that the sender unit (the actual resistor element) is the wrong resistance range to give a meaningful answer on your guage.

Adding to the angst is the fact that the early sending units are less than reliable

Where you get your resistor element (the little white ceramic "chip" inside the
plastic level sensor housing) is from a 1992-96 F-150/250/350
they oddly enough work perfectly.

I run a 1994 Ranger Supercab tank in the front of my 1987 supercab.
(this require minor frame modifications)
what really bothers people is that my rear tank is from a "narrow frame" (Dually wheel)
F-350/450 and the weirdest thing is I've replace the sensor in my front tank (an actual ranger tank though from the wrong year) and I've managed to get it to work to my satisfaction several times, what rubs me is that this situation has never lasted more than 3-4 months. and several times hasn't lasted through a tank of fuel.

Oddly the sender unit in the rear tank which I've never messed with,
I just installed it and was amused to discover that the guage worked
perfectly, and since I've learned through experience that you don't
f'up something that works perfectly I've left it alone.

back to my front tank I;'ve got the resistor "Chip" to put in my front tank
but I haven't had the oppertunity to install it.

Looks like I'm gonna be getting one because I think my front tank pump
is showing it's age.... whatever that age may be, it's a factory ford pump that I took from a junker and installed without awakeneing any demons.

AD
 
I run a 1994 Ranger Supercab tank in the front of my 1987 supercab.
(this require minor frame modifications)
what really bothers people is that my rear tank is from a "narrow frame" (Dually wheel)
F-350/450 and the weirdest thing is I've replace the sensor in my front tank (an actual ranger tank though from the wrong year) and I've managed to get it to work to my satisfaction several times, what rubs me is that this situation has never lasted more than 3-4 months. and several times hasn't lasted through a tank of fuel.

The resistance might be the correct value, but the power rating is too low.
 
another question: will the fuel tank off the 92 2wd fit with no problem on the 88 4wd, ifso i might just change it and all the fuel lines.


i have the cab off the 88 now and was looking, the motor cross member looks to be very easy to take off just alot of ribbets and a few little welds might still just change it.
 
The resistance might be the correct value, but the power rating is too low.

Bob, you forget who you are talking to...

The resistance values are wrong The '89-94 sensor will work
wrong and it'll work wrong forever, I don't recall the resistance
values it is a mechanically...

And the problem with the early resistor is a mechanical one, it was
relatively early in Ford's experience with Thick film technology as fuel level sensors go and the resistance material is abraded off the ceramic substrate.

Once it wears through the entire unit gets real flakey because it isn't a simple resistance, the way they created those potentiometers is more of a resistor matrix than a simple progressive resistance.

AD


another question: will the fuel tank off the 92 2wd fit with no problem on the 88 4wd, ifso i might just change it and all the fuel lines.


i have the cab off the 88 now and was looking, the motor cross member looks to be very easy to take off just alot of ribbets and a few little welds might still just change it.

You need to be a lot more specific about your two trucks because the tanks are all different and what you need to do varies depending on what you are attempting to put in and what you are putting it into.

Some tanks only fit the supercabs, because they cause a physical interference with the back of the Transfer case...

Others require the "Center tank" frame crossmember to be REPLACED because of the position of the tank vent.

all require ADDING a frame crossmember that the '88 doesn't have
(directly above the rear axle and attached only to the top flange of the frame rails)

And ALL require modifications to the front fuel tank crossmember to allow for the different (and WIDER) straps used on the plastic tanks

And then there are the differences in the lines and the filler hose...

IT's not impossible, but unless you tell me what you've got...

AD
 
the 92 2wd is reg cab with short bed, the 88 4wd is reg cab with long bed, both have the 2.3 and are 5speeds. is that enough
 
Personally I would swap tanks, much easier to remount a tank than to modify the '88 tank.
 

Actually yes, because you've obviously forgotten that I don't take crap from anybody.

I actually KNOW what I'm talking about

And failing that I can type faster than anybody else here:)


The fuel level indicator is part of a "system"
that is comprised of several components.

The Guage itself
The Sensor unit
The Instrument volage regulator
and
an "anti-slosh" module (this prevents the guage from bouncing like
a seismograph needle during an asteroid impact on every pothole)

The system on any one vehicle of a specific year is comprised of
components that are designed to work together.
If you change out any one component it will not work as intended.

My personal knowledge of this is both scientific/theoretical
but also empirical (I.E. Try it and see what happens)

Bob, this post is by way of disclaimer
Do not force me to post a disclaimer post because you feel a desire
to quibble about something I phrased in a specific way to avoid typing
in the sum of all human knowledge so someone understands something
that is really a minor technical point.

Unless you wanna shlep your ass to my keyboard and type to my dictation?

Otherwise put your hands in your pockets and keep them away from your keyboard.

Quibble other people who you suspect is spewing bovine excrement
you are good at that, but on deep technical stuff?
With no memorable exceptions the people you irritate deserve it.

I don't, and frankly I have no desire to even try putting up with it.


Find someone else to quibble...
Because I'm really not in the mood, nor am I likely to be in your lifetime.
(Don't piss me off unless you really wanna find out how nasty I can be)

Now that I've WASTED that energy because of Bob, I'll get to the actual question.


the 92 2wd is reg cab with short bed, the 88 4wd is reg cab with long bed, both have the 2.3 and are 5speeds. is that enough

Ok, you probably won't have to swap out that mid tank crossmember
(this is also the crossmember that ties the two front leaf spring mounts
together, aside from the engine crossmember the most stressed
crossmember in the frame)

You will still have to add the over axle crossmember.
This crossmember really only provides an attachment point for
the rear "third leg" of the '89-up fuel tank strap

you will also need to enlarge the keyhole slots in the drivers side
diagonal braces where the T-tab of the tank straps hook into the frame
(the later straps are wider)

And you will likely need to drill a holes for the inboard end of the straps
because they are probably located differently.

I say "probably" because my experience in doing the cross generation
tank swap (plastic tank from a Gen2 or 3 into a Gen1) is on a supercab.

I Believe you will need to shorten both fuel lines, and that in and of itself is
something of an adventure...

IF you are replacing fuel lines you will need to get them off of a Gen2 longbox
truck because the short box lines will be the wrong length.

Too long is a correctable though annoying problem, Too short = Screwed.


There may be compatibility issues with the fuel lines but if you can find any way to use the 1989-up style fuel lines DO IT.

the in tank pumps are more reliable and cheaper to replace than the frame mounted pump. eliminating the frame mounted reservoir cannister is a reliability improvement

Using the later line setup relocates the fuel filter from burried up against the engine crossmember where it is on all 1987-88's and relocates it back to where your frame mounted pump is now.... MUCH more accessable.

ANY change that makes the truck easier to work on and less likely to NEED to
be worked on is to be encouraged.

I don't mind a bit making improvements to my truck.
I absolutely HATE repairing stuff.
I have mixed feelings about making improvements as part of a repair.

Like a couple of weeks ago I had tpo replace a couple of internal frames
for the aluminum topper on my truck.

But now the side doors actually LATCH

All four latches are keyed alike. (Two on the back gate offers better security)

All three doors actually stay open (even if ONE (of two) pneumatic
strut(s) is physically removed)

And I replaced the weather stripping.


AD
 
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