Harpoon Question

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May 20, 2007 | 10:16 AM

222mjh

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Joined: Mar 2007

Posts: 22

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From: Vandalia, IL

Harpoon Question

I have always been told not to fill fuel tanks past two clicks of the pump. The reason for this is that the float was designed to travel only so far. Adding additional fuel, float tries to raise more, thus puts more strain on the sensor. Which inturn shortens the lifespan of the fuel sensor.

Has anyone else heared of this before? After doing the harpoon mod, has anyone had the sensor failure? Just wandering if there was any truth to what I have always been told. Would like to know all the down sides of a mod before hand so that I can make sure the pros out weight the cons...........

May 20, 2007 | 10:35 AM

WMRiceman

Senior User

Joined: Oct 2004

Posts: 160

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From: King George, Virginia

I fill mine up till I can see the fuel in the filler neck. I've been doing that for 50k miles and the gauge still works fine. I've also completed the harpoon modification and I see no cons. Mark

May 20, 2007 | 11:25 AM

clintbonnie

Cargo Master

Joined: Jun 2003

Posts: 3,292

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From: Ardenvoir, Washington

Same here.. filling to the top for 70K miles.. no problem.

May 20, 2007 | 12:05 PM

Uzumati

Post Fiend

Joined: Jun 2006

Posts: 5,497

Likes: 7

From: Central, Al

No probs so far here. The float in our tanks is able to flex a good bit due to the long rod.

May 20, 2007 | 07:09 PM

preppypyro

FTE Legend

Joined: Aug 2004

Posts: 37,887

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From: North Central Rural Sask.

In my owners manual, it also says not to overfill or it will over pressurize the tank, anyone run into that at all?

May 20, 2007 | 07:35 PM

magnum300

Senior User

Joined: Jun 2004

Posts: 391

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From: west MI

If you get fuel in the morning and go park it on a hot day the fuel will expand, as long as there is some room in the filler pipe there should be no problem.

May 20, 2007 | 07:35 PM

Fat Diesel

Logistics Pro

Joined: Aug 2005

Posts: 3,886

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From: Morgan Hill, CA

Nope. I've had mine modded for about 150,000 miles and it still works fine. I run it down to where it's nearly out then I fill it to the absolute top.

You might consider an aftermarket pickup tube if you're going to have the tank out. I'm getting ready to pull mine AGAIN for the 5/8" draw tube from ITP I ordered yesterday.

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May 20, 2007 | 09:33 PM

PowerstrokeJunkie

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Joined: Jul 2005

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From: 21791

Quote:

Originally Posted by preppypyro

In my owners manual, it also says not to overfill or it will over pressurize the tank, anyone run into that at all?

The tank has TWO vents. You have to be in some serious mud to even think about clogging those vents.

May 21, 2007 | 10:13 AM

#10

Mike F250

Laughing Gas

Joined: Feb 2007

Posts: 775

Likes: 0

From: Williamston, MI

the instructions for the mod indicate the sensor/assembly is fragile and to handle with care. I could see it not working after install if reasonable care is not exercised...