Harpoon Mod Question
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Lead Driver
Joined: Dec 2006
Posts: 7,092
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From: San Diego, CA
Harpoon Mod Question
I'm going to have my fuel tank dropped for some fuel line mods (ITP in-tank mod) and am toying with doing the harpoon mod (cut the two vent lines with a pvc cutter) so my tank will fill up without all the fuss.
My question is if anybody who has done this already has any problem with the diesel spilling out of the filler neck? Some of the stations I fill up at I will see the fuel froth coming up my filler neck when the pump shuts off with the longer vent lines. I would like to do the mod but not if I will spill diesel out of the filler neck every time I fill up.
Any feedback is appreciated. Thanks.
My question is if anybody who has done this already has any problem with the diesel spilling out of the filler neck? Some of the stations I fill up at I will see the fuel froth coming up my filler neck when the pump shuts off with the longer vent lines. I would like to do the mod but not if I will spill diesel out of the filler neck every time I fill up.
Any feedback is appreciated. Thanks.
Senior User
Joined: Mar 2003
Posts: 489
Likes: 1
From: Western Kentucky
I cut the tubes on mine without any problems. I also made the filler plug bigger. Now I can use the big rig pumps. It rings up dollars like other stations rings up pennies. 
The downside I didn't think about is it takes more money to fill it up now since it has more capacity.
The downside I didn't think about is it takes more money to fill it up now since it has more capacity.
Hotshot
Joined: Nov 2006
Posts: 11,286
Likes: 263
From: North of Greenville
Before I did the mod, hte foam you're talking about would shut off the pump and I would trickle in another 4.5-5.5 gallons before I would see fuel coming up the filler neck.
Now that I've done the mod, when the pump clicks off, I can barely get one more gallon trickled in before I see the fuel.
In neither case did I ever have problems with fuel gushing backwards out of the fill-tube.
Now that I am using B20, there is almost ZERO foaming. However, when the pump clicks off, I still have less than one gallon to top off the tank to where I can see the fuel.
Now that I've done the mod, when the pump clicks off, I can barely get one more gallon trickled in before I see the fuel.
In neither case did I ever have problems with fuel gushing backwards out of the fill-tube.
Now that I am using B20, there is almost ZERO foaming. However, when the pump clicks off, I still have less than one gallon to top off the tank to where I can see the fuel.
Post Fiend
Joined: Jun 2006
Posts: 9,714
Likes: 2
From: White Mnt's,New Hampshire
no trouble with mine ether..if you haven't started yet...get a pair of ratchet PVC cutter for around 10 bucks..it will make cutting them tubes a lot easer and do a much a cleaner job..
Post Fiend
Joined: Jun 2006
Posts: 9,714
Likes: 2
From: White Mnt's,New Hampshire
Originally Posted by weekendwarriorfsw32
Do you have to drop the tank to do this or not
Thanks
Nick
Thanks
Nick
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Posting Guru
Joined: Mar 2007
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From: East Peoria, IL
Originally Posted by ggirten
While it is easier to drop the tank, I think you can pull the bed if you wish.
In Nick's case it might be a little tougher to pull the bed off of his excursion
just giving you a hard time man
Senior User
Joined: Mar 2003
Posts: 489
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From: Western Kentucky
Originally Posted by nhill2090
In Nick's case it might be a little tougher to pull the bed off of his excursion
just giving you a hard time man
just giving you a hard time man
Not a problem. I should have read his signature to see what kind of vehicle he had.
Posting Guru
Joined: Mar 2007
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From: East Peoria, IL
i am getting the Hutch in tank kit for xmas and i plan on dropping the tank and doing the harpoon mod as well, along with a few other small things i will hopefully get including the superlift truspeed, 3gauges and pod, and SS HPX line
Senior User
Joined: Mar 2003
Posts: 489
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From: Western Kentucky
Originally Posted by nhill2090
i am getting the Hutch in tank kit for xmas and i plan on dropping the tank and doing the harpoon mod as well, along with a few other small things i will hopefully get including the superlift truspeed, 3gauges and pod, and SS HPX line