harpoon mod? - Ford Powerstroke Diesel Forum
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post #1 of 17 Old 11-09-2009, 07:04 AM Thread Starter
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harpoon mod?

My truck was delivered to the shop today for a new FASS fuel pump. I'd like to do the harpoon mod as well, what do I tell the shop, I've never seen inside a super duty's fuel tank to know what I'm talking about.



2005 F-250 4x4 CCSB
Straight piped, deleted, leveled and rockin 305's.
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post #2 of 17 Old 11-09-2009, 07:55 AM
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Hope this helps...

08 Harpoon Mod

2012 F-350 SRW King Ranch
SOLD - 2004 Lariat F-250 4x4
6.5 Pro Comp Lift W/ Fox Shocks, DeeZee Tool Box, 08 Diff. Cover, 37x13.5/20's Pro Comps, Zoodad Mod, SCT w/custom tunes, 4 in EX., AFE Intake, ARP, Recon Lights, High Idle Mod, RCD EGR Delete, Fumoto Valve, Oil Bypass Kit, 03 Turbo, Yukon Gears, Farmboy Stage II Traction Bars, Dieselsite Coolant Kit, Amsoil, HIDS, Edge Insight CS, PHP FICM
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post #3 of 17 Old 11-09-2009, 09:54 AM
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post #4 of 17 Old 11-09-2009, 09:55 AM Thread Starter
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That's a good read. Thanks!



2005 F-250 4x4 CCSB
Straight piped, deleted, leveled and rockin 305's.
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post #5 of 17 Old 11-09-2009, 09:58 AM
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Quote:
Originally Posted by smokersteve View Post
What is this for?
It allows you to fill the tank up completely to the rim without the fuel foaming. You can easily get 3-5 more gallons of fuel in the tank

The Mullet Mod
Stock 2005 F-350 4x4
*Afe Intake
*4" TB Exhaust
*Scangauge
*SCT
*Bulletproof Diesel oil bypass
*Bulletproof Diesel water pump
*Tuned FICM
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post #6 of 17 Old 11-09-2009, 10:34 AM
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post #7 of 17 Old 11-09-2009, 11:07 PM
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Quote:
Originally Posted by rodmodder View Post
My truck was delivered to the shop today for a new FASS fuel pump. I'd like to do the harpoon mod as well, what do I tell the shop, I've never seen inside a super duty's fuel tank to know what I'm talking about.
Here is a pic of the inside of a 2005 fuel tank looking back towards the fill tube and the vent tube:


For the Harpoon mod, you only have to cut the vent tube (it doesn't make any difference if you cut the fill tube or not). You just cut it as close to the top of the tank as you can.

Here's a pic of it completed:


Normally when you fill your tank, as soon as the fuel reaches the vent tube it will cause the nozzle to shut off and you will have to keep clicking the nozzle a little at a time to get more fuel into the tank.
With the Harpoon mod done, the nozzle will not click off until the fuel level reaches the new end of the vent tube, so your tank will now be almost completely full when the nozzle clicks off for the first time

It is about a 3-4 gallon difference!!! And well worth doing.

2005 F-250 CC/SB 4x4 medium wedgewood blue

5" lift, 5" Donahoe rear springs, 35x13.50 MTZ's, 18x12 Fuel Hostage wheels, 4.30 gears, Banks 4" exhaust, Airraid intake, SCT from Innovative, ARP headstuds, Bulletproof ficm, Scangauge II, Randy Ellis Design lightbar, Street Scene flares, Harpoon mod, Zoodad mod, LED 2010 taillights, Switchback LED front turn signals
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post #8 of 17 Old 11-10-2009, 01:54 AM
Other vehicle is an F250
 
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Here's a link to thread when I dropped my tank for another project and did the harpoon mod. I can run the nozzle wide open until the last .4-.6 gallon. Saves a ton of time at the pump and you can get more fuel in there. I figured 5 gallons or more. Well worth the time spent doing it and it is good to know that you are starting over with a clean tank! Mine was crystal clean anyway? Don't forget to clean the screens in the sending unit. I didn't know about this in time and may drop mine again to do this one day. Good luck!

Dropping Fuel Tank

2001 F250 Lariat Crewcab, Automatic, 4X4

(Late '99 Regular Cab Work Truck)


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Stage 1 Injectors ~ HankDaddy Mod. ~ BUILT TRANNY! 352 HP Shootin' for 375!
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post #9 of 17 Old 11-10-2009, 02:12 AM
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Send a message via AIM to BIGBILL105 45
This is the harpoon mod I want for the back of my truck!

PM ME FOR VINYL DECALS!
SOLD!!!!!

ARP head studs
4 inch down pipe
5 inch straight pipe
ts 6 pos chip
foil delete w/ polished IC pipes
ugly step delete
2% tint
black lariat rims
35 inch Pro Comp Xterrains
7 inch in dash dvd player
remote starter
16.265
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post #10 of 17 Old 11-10-2009, 06:05 AM
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subcribed...

Cory

1995 F-250 XLT
7.3 Powerstroke Lapis Blue Metallic SuperCab ZF5 3.55 2wd Long Bed 275k miles
3.5 from the downpipe to stock 6.4 muffler, 43367 diy intake.

1993 F250 XL RCLB Turbo 7.3 IDI zf5 2wd 223k miles; 5 inch exhaust & tint -sold-
2006 F350 Lariat Harley Interior CCSB 6.0 Powerstroke 5r110 4x4 43k miles; SCT, EGR delete, ARP studs, tint, & 5 inch exhaust -sold-
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