[gregrob]

Will somebody explain these to me?
I've done some searching, but it seems they've been around so long, folks discuss them as if everyone know what they are.
In-tank, prepump, regulated return, harpoon, hutch mod, gooch mod, or whatever. What do all these mean and why would I do them.

I think I know the goal is to reduce air bubbles in the fuel, like with a FASS or Airdog. Are the kits that Dennis, Lott, Bob and others sell the same as these, or better?


Thanks a ton guys, I'd like to get a little better fuel mileage and want to play with these things for a while for that reason as well as a smoother, better running engine.

Let the games begin.

 

[clamgulch]

In tank: Modification of the stock mixing valve, usually removing it altogether and extending the return line so it won't churn the fuel being sucked in to the suction line.

The filler line extends into the tank about 5" on the pickup leaving a big bubble at the top- like 5 gallons. On the excursion it's only a couple inches and not worth dropping the tank for. The mod is to simply cut it off as flush with the inside of the top as you can.

Gutting the filler neck for accomodating the larger diameter "big rig" fuel nozzle is common. That means removing the flapper inside which is designed as part of the roll over protection. I suggest using a fuel cap.

The fuel suction line from the top of the tank to the fuel pump has a quick release fitting that is designed for pressure, not suction, and it leaks air into the fuel. Contributes to cackle and poor performance. cut it out and replace it with good diesel rated fuel line. The return side isn't a problem.

Regulated fuel mod: instead of having the fuel pressure controlled by the factory regulator built into the fuel bowl, AND instead of having the fuel dead end in the heads, a Aeromotive type adjustable bypass regulator is used and the fuel system is replumbed to eliminate the fuel dead ending in the heads where air bubbles accumulate. Lots of variations on this mod, but they all accomplish basically what I've stated.

FASS and AIRDOG are similar products that remove entrained air from the fuel. I've never had one but I have never heard of anyone badmouthing one after buying and installing one. I'm not aware of any other similar product on the market, however it is apparently possible to build something that will accomplish the same thing for around $50, so I've heard...but not seen.

 

[pabrannan]

[ QUOTE ]
In tank: Modification of the stock mixing valve, usually removing it altogether and extending the return line so it won't churn the fuel being sucked in to the suction line.

The filler line extends into the tank about 5" on the pickup leaving a big bubble at the top- like 5 gallons. On the excursion it's only a couple inches and not worth dropping the tank for. The mod is to simply cut it off as flush with the inside of the top as you can.

Gutting the filler neck for accomodating the larger diameter "big rig" fuel nozzle is common. That means removing the flapper inside which is designed as part of the roll over protection. I suggest using a fuel cap.

The fuel suction line from the top of the tank to the fuel pump has a quick release fitting that is designed for pressure, not suction, and it leaks air into the fuel. Contributes to cackle and poor performance. cut it out and replace it with good diesel rated fuel line. The return side isn't a problem.

Regulated fuel mod: instead of having the fuel pressure controlled by the factory regulator built into the fuel bowl, AND instead of having the fuel dead end in the heads, a Aeromotive type adjustable bypass regulator is used and the fuel system is replumbed to eliminate the fuel dead ending in the heads where air bubbles accumulate. Lots of variations on this mod, but they all accomplish basically what I've stated.

FASS and AIRDOG are similar products that remove entrained air from the fuel. I've never had one but I have never heard of anyone badmouthing one after buying and installing one. I'm not aware of any other similar product on the market, however it is apparently possible to build something that will accomplish the same thing for around $50, so I've heard...but not seen.

[/ QUOTE ]

"Gutting the filler neck for accomodating the larger diameter "big rig" fuel nozzle is common. That means removing the flapper inside which is designed as part of the roll over protection. I suggest using a fuel cap."

My flapper didn't give a complete seal the way it was designed, so if I had flipped fuel would still leak out. I too use a fuel cap. Nice mod though, makes fueling at the big rig pumps a breeze.

Paul B

 

[gregrob]

<font color="darkblue">So are this:</font>
[ QUOTE ]
In tank: Modification of the stock mixing valve, usually removing it altogether and extending the return line so it won't churn the fuel being sucked in to the suction line.

[/ QUOTE ]

<font color="darkblue">And this:</font>

[ QUOTE ]

The filler line extends into the tank about 5" on the pickup leaving a big bubble at the top- like 5 gallons. On the excursion it's only a couple inches and not worth dropping the tank for. The mod is to simply cut it off as flush with the inside of the top as you can.


[/ QUOTE ]

<font color="darkblue">The same mods? Are they both called the In-Tank mods? Do I have to drop the tank? How does the filler line mod eliminate air from the system?

As for this one, mine usually doesn't have a problem.
</font>

[ QUOTE ]

Gutting the filler neck for accomodating the larger diameter "big rig" fuel nozzle is common. That means removing the flapper inside which is designed as part of the roll over protection. I suggest using a fuel cap.


[/ QUOTE ]

<font color="darkblue">Any pics or anything on how to do this, where to get the lines?</font>

[ QUOTE ]

The fuel suction line from the top of the tank to the fuel pump has a quick release fitting that is designed for pressure, not suction, and it leaks air into the fuel. Contributes to cackle and poor performance. cut it out and replace it with good diesel rated fuel line. The return side isn't a problem.


[/ QUOTE ]

<font color="darkblue">For this one I would need a kit like from Dennis at ITP, correct? Is there a wa to do the kit myself?</font>

[ QUOTE ]

Regulated fuel mod: instead of having the fuel pressure controlled by the factory regulator built into the fuel bowl, AND instead of having the fuel dead end in the heads, a Aeromotive type adjustable bypass regulator is used and the fuel system is replumbed to eliminate the fuel dead ending in the heads where air bubbles accumulate. Lots of variations on this mod, but they all accomplish basically what I've stated.


[/ QUOTE ]

<font color="darkblue">I'm very interested in the $50 version of this, where did you learn of this?</font>
[ QUOTE ]

FASS and AIRDOG are similar products that remove entrained air from the fuel. I've never had one but I have never heard of anyone badmouthing one after buying and installing one. I'm not aware of any other similar product on the market, however it is apparently possible to build something that will accomplish the same thing for around $50, so I've heard...but not seen.

[/ QUOTE ]

Ok, just a couple more, why do I need one of these? http://www.itpdiesel.com/store.php?crn=152&rn=407&action=show_detail

and which one of these is the Hutch mod, Harpoon mod etc?

 

[richmondfarms]

Harpoon mod is the filler line mod, has no effect on getting air in your fuel line, only the volume of fuel in your tank.

 

[bigrpowr]

you aren't gonna see much for fuel mileage from any of these mods. the reg. return will make it run a little smoother, you'll do the fuel delivery for performance not mileage. just do 5/8 line from the tank to the motor.done.

 

[ddog]

3862 posts in 7 months (thats 18.4 posts per day /ubbthreads/images/graemlins/shocked.gif)and you are just now asking this question? Maybe spend some more time reading and less time posting /ubbthreads/images/graemlins/grin.gif

Go HERE to the LITTLE SECRETS and spend about the next week reading in your spare time. Most all the popular mods and their origin as well as as lots of other topics (cackle, etc)are covered in sections organized alphabetically. Most all of the threads with mods discussed have links to pictures, etc. The information hasn't been updated or added to since 7/30/05.

harpoon mod-named for user Maroonharpoon- Modifying or shortening the vent line extension in the tank to allow you to fill it to the top faster, particularly those last thre to four gallons after the pump clicks off.

Hutch mod- named for user hutchinaugusta- eliminating the air causing joints on the suction side of the pump (between the tank and the pump)including modification of the fuel pick up in the tank. Hutch also did a lot of work on regulated return systems.

Regulated return mod. Not named for any one individual but the bulk of the work was done by user TexasTowncar as well as a lot of research on cackle . He has since passed on from this world, but there is still a website and folks carrying on his work. I believe you can get plans and information on building your own reg return system from his website. MORE INFO On REG RETURN

Lots of other interesting stuff in the Little Secrets. Happy Reading!

 

[bunting]

[ QUOTE ]
3862 posts in 7 months (thats 18.4 posts per day /ubbthreads/images/graemlins/shocked.gif)and you are just now asking this question? Maybe spend some more time reading and less time posting /ubbthreads/images/graemlins/grin.gif



[/ QUOTE ]

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