Fuel Gauge Stays Pegged on Full - Diesel Forum - TheDieselStop.com
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99 & up 7.3L Power Stroke Engine and Drivetrain Discussion of the 99 & up 7.3L Power Stroke diesel engine and drivetrain in the 1999-Up Super Duty trucks and Excursions. No gas engine discussion allowed except on transmissions and drivetrain that pertain to all models. Please confine discussion of topics in this forum to those items that are specific to the 7.3L Power Stroke engine.

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Old 10-11-2005, 10:56 PM   #1 (permalink)
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Fuel Gauge Stays Pegged on Full

I don't think I am lucky enough to have the magical fuel fairy coming to visit me with a fresh tank of fuel every night so where should I start with my little problem?

Key off needle drops to empty position, Key on needles pegs back to full and stays there. By my estimation (miles traveled on this tank) I should be somewhere near the half full mark by now. Where should I go with this?
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Old 10-11-2005, 11:39 PM   #2 (permalink)
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Re: Fuel Gauge Stays Pegged on Full

My truck had this problem last week. I just filled the tank and tapped on the tank with a rubber mallet, that fixed the problem for me. If that does not fix the gauge it could be a electrical problem or the float could be stuck in the tank.
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Old 10-11-2005, 11:39 PM   #3 (permalink)
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Re: Fuel Gauge Stays Pegged on Full

How many miles has it been?
With th e large tank if I fill all the way to the neck it will go almost exactly 134 miles each time before the guage moves a little.
From absolutely full to just below 3/4 is about 15 gal. from there to about a 1/2 tank on the guage is another 5 gal give or take a little..
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Old 10-12-2005, 09:17 AM   #4 (permalink)
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Re: Fuel Gauge Stays Pegged on Full

Kanman,
I posted the same problem earlier this week. If you figure something out pm me. thanks,
Joe46
PS. 1O6 said to try a real bumpy road-did that-no change
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Old 10-12-2005, 10:46 AM   #5 (permalink)
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Re: Fuel Gauge Stays Pegged on Full

I've tried the bumping and the tapping and the driving and the jogging and nothing works for me but dropping the tank. Did mine again last week and it always is jammed up at the top pretty tightly. The float arm seems to be slightly longer than the distance from the pivot to the top mount, so if it gets slammed up there, it move over center and looks in place. Ugh. I don't see it coming loose by itself. I think next time I'll probably just bend the float arm a little bit and live with whatever gauge inaccuracies I get from it.

If you guesstimate it to when there's less than 10 gals left, it's not a bad job to drop the tank enough to get the sending unit out of the top. Took me about 45 mins last time.

Good luck.
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Old 10-12-2005, 01:31 PM   #6 (permalink)
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Re: Fuel Gauge Stays Pegged on Full

I was wondering if this was an issue with the tanks when guys do the Harpoon Mod. Seems to me that if you fill it all the way up plus some, you risk sticking the float. I'm planning on doing the Harpoon Mod myself, is there anyway to put an upper stop on the float to prevent sticking? Seems that a bolt clamped on (with the appropriate lock washer, etc. to prevent it from coming off) or other type stop would be feasible without having to bend the float arm. Since I haven't seen the pieces parts to this thing yet, I'm curious of the opinion of the guys who have.
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Old 10-12-2005, 04:14 PM   #7 (permalink)
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Re: Fuel Gauge Stays Pegged on Full

[ QUOTE ]
Kanman,
I posted the same problem earlier this week. If you figure something out pm me. thanks,
Joe46
PS. 1O6 said to try a real bumpy road-did that-no change

[/ QUOTE ]

Joe, I was reading that thread last night. I was hoping one of you guys figured out an easy solution by now; guess not [img]/ubbthreads/images/graemlins/crazy.gif[/img] I would rather take a butt whoopin than have to pull the tank. The thought of diesel fuel raining down on me does not excite me in the least bit lol.

Mine quit working last weekend as I was being a goon at the track, racing again and again. I wonder if the fuel slosh bent the float guide somehow and its wedged in there? Not sure how everything lays in there, guess ill have to go hunt down a photo.
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Old 10-12-2005, 04:42 PM   #8 (permalink)
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Re: Fuel Gauge Stays Pegged on Full

This has hapopened to me 3 different times. In every instance, once the tank was refilled to the brim, it dislodged it. I have 188K on my truck, so it does not happen often. I always fill up my truck to the brim. My bet is if you refill your tank the issue may resolve itself.
Good Luck
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Old 10-12-2005, 08:06 PM   #9 (permalink)
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Re: Fuel Gauge Stays Pegged on Full

I haven't done the harpoon mode on my tank. The last time I went wheeling, I only filled the tank up about 2/3 of the way and it still happened. I think how hard you bounce it around effects how easy it is to become unstuck. None of the other tricks have ever worked for me, and once I got in there and unhooked it by hand, I can see why. In my case, it's been pretty well pinned in there every time.

You may be able to figure out something to stop it, but my guess is that a slight bend in the arm would be the quickest and most likely to fix and not damage anything else approach. I would say the throw on the float is probably around 12", and the bend probably only needs to be enough to reduce this down to about 11", so I doubt it would effect the gauge reading that much.

I'm sure there's lots of ways to skin this one though...
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Old 10-12-2005, 09:36 PM   #10 (permalink)
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Re: Fuel Gauge Stays Pegged on Full

Mine's been that way since late spring.... I've been dreading dropping the tank for just the gauge. When I did all my fuel mods I had the bed off. Anyway I just keep good track of the miles that I travel on a tank. I did this before just to keep a rough track of fuel economy, so it isn't a big enough deal for me to want to drop the tank yet.

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Old 10-12-2005, 09:42 PM   #11 (permalink)
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Re: Fuel Gauge Stays Pegged on Full

I have a different problem. I can fill the tank up, drive almost exactly 23 miles, and I have 3/4 of a tank left. I refuse to believe I have burned that much fuel. I usually get 305 to 325 miles to a tank. I bought this '01 with 40,000 miles on it. Any suggestions?

Thanks,

Chad
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Old 10-13-2005, 07:49 AM   #12 (permalink)
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Re: Fuel Gauge Stays Pegged on Full

Trade it... WOW, 325 per tank (I am assuming approx. 28 gallon tank)... That is 11.5 mpg. Are you towing or unloaded? If towing it isn't that bad. If it is all unloaded, there is a problem somewhere. At something that poor, I would be looking for a leak (tank, fuel filter drain bowl - possibly the 10 cent gaskets/o-rings behind the fuel filter drain valave are leaking). Fuel has to be going onto the gound somehow to get that poor mileage... Just my SWAG!
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Old 10-13-2005, 09:42 AM   #13 (permalink)
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Re: Fuel Gauge Stays Pegged on Full

Every fill up usually requires about 20-21 gallons if I wait until the low fuel light comes on. I am wondering if there is a problem with the float, and i really have 7-8 gal more when the gauge/light says it is empty? Like I said, I haven't had this truck long and just assumed it had a smaller tank. Is that possible?

I don't tow with the truck but I do carry 800-1000 lbs. of stone int the bed all the time.
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Old 10-13-2005, 10:08 AM   #14 (permalink)
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Re: Fuel Gauge Stays Pegged on Full

I believe ALL CC SB's have the smaller tank (28-29 gallon)...
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Old 10-13-2005, 10:36 AM   #15 (permalink)
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Re: Fuel Gauge Stays Pegged on Full

Well according to the Owner's guide I've got a 29 gallon tank.. The 23 gallon is on the cab & chassis model w/ the neck on the right side.

I guess I will have to drop the tank to check it out. Any other suggestions? Thanks for the insight
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