What is it...
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Posting Guru
Joined: May 2007
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What is it...
After reading guzzles site and this site, what exactly is the "in tank" mods? my fuel system is completly stock and i am ready to start beefing it up. I just dont understand what this is helping, ps. i will be running clays in tank pump
Lead Driver
Joined: Jul 2003
Posts: 7,406
Likes: 52
From: Wheatland, Mo
Different pick up tube with a screen at the end. It is also a little longer so you get a little more run time from the tank. I haven't done it but my buddy did. Spent more time dealing with the fill tube than the mod itself.
Lead Driver
Joined: Jun 2007
Posts: 7,760
Likes: 27
From: Hampton, Maryland.
Kenny, the lines in the tank from the factory have quick disconnect fittings that are prone to sucking air. Air is supposedly bad for the injectors. In tank mods are supposed to fix that and while you are in there, you will also want to clip the vent hose as close as possible to the top of the tank. This will allow you to put almost all the fuel in before the pump kicks off. In my short bed the pump will start kicking off at about 24 gallons if i run it down low enough, but if I take my time and go slow, I can get 31 gallons in there but it takes an extra 10-15 minutes to get that last 7 gallons in because of the foam. When I clip that tube, almost all of the 31 gallons will go in before any foam comes up the neck. (at least that is what I have been lead to believe by the many here that have done the in-tank mods.) 
Of the next Riffraff East
Joined: Oct 2004
Posts: 8,679
Likes: 2
From: Concord NC
Kenny, I would have figured you would want a larger volume fuel system witht the demand you are asking for. Mike, Tenn01PSD went with a sump design system where he pulls his fuel directly out of the bottom of the tank. I would think a larger set of line, both delivery and return would be a must for you. Although I don't remember thinking you ever ran low on fuel during you runs on the strip or dyno.
Post Fiend
Joined: Mar 2007
Posts: 26,966
Likes: 50
From: Texas
I'll agree with Barry you'll probably want more than just the in tank mods, but to answer your question
1) It eliminates the screens inside the mixing chamber which can become partially or fully plugged causing some severity of a fuel restriction.
2) Re-routes the discharge point for the fuel return. Since diesel has a tendency to foam up when pumped, you don't want the fuel being pumped back into the tank from the filter to foam up right next to your fuel pick up foot.
3) Trimming the fill and vent tubes inside the tank will allow you to pump a few more gallons in the tank before the pump clicks off.
1) It eliminates the screens inside the mixing chamber which can become partially or fully plugged causing some severity of a fuel restriction.
2) Re-routes the discharge point for the fuel return. Since diesel has a tendency to foam up when pumped, you don't want the fuel being pumped back into the tank from the filter to foam up right next to your fuel pick up foot.
3) Trimming the fill and vent tubes inside the tank will allow you to pump a few more gallons in the tank before the pump clicks off.
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Post Fiend
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From: Liberty Lake, WA
Posting Guru
Joined: Feb 2007
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From: North Cackalacky
I'm waiting on Clays kit to come out. After talking to him about it I'm glad that I never went with the other options. And it sounds like the price is gonna be real good for what you get.
A little OT here Kenny but what was your best time at the dragstrip at RRE?
A little OT here Kenny but what was your best time at the dragstrip at RRE?
Post Fiend
Joined: Feb 2006
Posts: 11,892
Likes: 2
From: Middle Tennessee
Put a sump on it Kenny. Use large fittings and line to a good quality filter/pump on the frame rail. You will never run out of fuel as it is gravity fed. Well, unless your mounting of the excess fuel line comes loose and gets into the front drive shaft and rips in two and yanks the transmission harness out of the connectors on the firewall which is what happened on my first run at RRE.
Funny thing about a simple design is that I was able to cut and splice my line back together with a spare Fram in line filter that cost $3 at Wally. Now I have double prepump filters.
If you ask me this is the only way to go as you are not lifting anything out of the tank, every part of it is external and will never require removal of the tank to service, and you will never have to drop the tank again. Did I say that already?
Funny thing about a simple design is that I was able to cut and splice my line back together with a spare Fram in line filter that cost $3 at Wally. Now I have double prepump filters.If you ask me this is the only way to go as you are not lifting anything out of the tank, every part of it is external and will never require removal of the tank to service, and you will never have to drop the tank again. Did I say that already?
Post Fiend
Joined: Feb 2006
Posts: 11,892
Likes: 2
From: Middle Tennessee
You need to be able to maintain fuel and HPO to run big numbers up high and I knew one was off. There was some comment about timing but that fuel pressure goes a long way to explaining what I saw, at least IMHO.
