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Author Topic: pegged fuel gauge  (Read 1487 times)

Cloyd Robinson

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pegged fuel gauge
« on: February 06, 2020, 09:22:07 PM »
So here I am getting everything ready for my first trip in the coach. Right after I purchased it, I topped off the fuel tank. The gauge had been working perfectly. The gauge immediately pegged and that is where it has stayed. I have read about algae in fuel and am wondering if this could have something to do with this problem.
Cloyd Robinson
2006 Monterey C9
Bend, OR
2006 Monterey C9

Joel Ashley

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Re: pegged fuel gauge
« Reply #1 on: February 06, 2020, 10:05:39 PM »
Not sure algae would foul the gauge, but it takes a good number of miles before mine shows a drop after a fill-up.  Then it’s accurate enough for me to estimate how many gallons I‘ll need to refill, usually best practice at the half-tank point.

Algae grows at the interface between fuel and any water it’s floating on.  Keeping the tank full during storage or long camps is your best defense, especially in humid regions and/or cold weather.  I use Power Service products, and might suggest their Bio Kleen (a pint is adequate, added according to directions) and then perhaps regular use of one of their other additives.  If algae is in the tank from a previous owner’s neglect, it may show as dark particles in the clear water-separator bowl at the bottom of the Primary fuel filter.
https://powerservice.com/products/
Many Power Service products can be found at hardware and auto parts stores, but Bio Kleen can be harder to come across.

https://www.bellperformance.com/bell-performs-blog/recognizing-diesel-fuel-algae

Joel
« Last Edit: February 06, 2020, 10:22:34 PM by Joel Ashley »
Joel and Lee Rae Ashley
Clackamas, Oregon
36.9 ft. 2006 Monterey Ventura IV, aka"Monty Rae"
C9 400HP Cat
towing a 1997 Ford Explorer Limited, aka "Pearl"
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Gerald Farris

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Re: pegged fuel gauge
« Reply #2 on: February 07, 2020, 03:35:50 AM »
Cloyd,
There is virtually no chance that microbial growth that is commonly called diesel algae, is causing a problem with your fuel gauge. Microbial growth in fuel is a common cause for frequent fuel filter restrictions in humid areas, but it does not cause gauge malfunctions.

If you can give me the readings for your fuel gauge at different levels, and the ohms for your fuel tank unit at different levels, I can tell you where to look to correct your problem, or if you actually have one.

Gerald
2002 Solitaire (2017 -  )
2000 Marquis, C12 (2004 - 2017)
1993 Patriot  (2000-2004)
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Larry Fisk

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Re: pegged fuel gauge
« Reply #3 on: February 07, 2020, 04:28:30 PM »
My gauge did the same thing. The problem was one of the sensor wires had become loose. I simply pushed the wire connector on all the way and then tightened it to the slip on connection with needle nose pliers. Gauge once again shows level perfectly. My level gauge is located on the drivers side of the fuel tank and is mounted on the side of the tank. I had to slide under the coach to access it. Yours may be located differently.
Best regards,
Larry Fisk
Larry Fisk
2005 Patriot Thunder 40 ft.
525 (C-13) CAT Engine
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Al Anderson

  • 2002 Beaver Marquis
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Re: pegged fuel gauge
« Reply #4 on: February 10, 2020, 11:50:47 PM »
I had a similar problem with mine and I found corrosion not only on the wire coming from the gauge but also on the ground wire.  After a year of the gauge reading erratic, I replaced the end on the guage wire and replaced the ground wire with a new one. 

I have now driven 20K miles and it has worked flawlessly.
Al Anderson, 2002 Beaver Marquis, 42 Feet Long
Cat C12 505 HP
2 Slides with a Tag Axle
Toad: 2013 GMC Sierra Denali Diesel
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Ray Bendle

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Re: pegged fuel gauge
« Reply #5 on: March 26, 2020, 10:44:01 PM »
Just got our coach last year. Had same issue needle pegged on bouncy section of I 90 between Erie and Buffalo.  Assumed it was going to be a wiring or sender issue. Was actually needle on gauge stuck against glass of gauge. Gave it a couple of raps with my knuckle and it returned to normal. 
2001 Marquis Emerald 42 X Edition 500 Cat