Anyone come up with a good homebrew setup for boost to fuel pump tube?

[dieselcruiserhead]

Weird question I think because of the 4BT... I recently replaced head gasket and when I got the head back from the machine shop, and long story short I advanced the timing so that the head of the pump is in the way of me reinstalling the OEM boost tube to the fuel pump head (not sure the right terminology here)...



So, I basically came up with my own little setup using 300 psi flexible rubber hose that's braided... Anyway, logic would tell me if the flexible hose is rated to 300 psi, then under 15-20 lbs of boost, it would not expand. But the OEM tube is metal and/or a stiff plastic, not a rubber like what I have. I basically need to make some sort of tube and would prefer to do it with a stiff plastic tube like a small flexible PVC or osmething like that (similar to the Cummins replacement plastic) but can't think of a good source for this... Hope all this makes sense. Here is a photo of my current setup. Just not sure it "cuts the mustard" if you know what I mean...

 

[swankmetal]

i use a very short piece of boost line. i think it's rated at 100psi. 1/8". the black stuff because it seems a little more flexible. and i tapped the cover for 1/8" NPT so i could put a regular old compression fitting in there. i'll go take a pic.



dave

 

[swankmetal]

here you go. it's been working great for me. i need to replace the fitting on the cover with one like what's on the head.

 

[boatpuller]

I would just leave the soft Rubber Hose, it cannot expand enough to make a difference in the way the boost is delivered to the diaphram. In relation to the volume of air that is available from the Turbo any expansion of the hose is very minimal.



Caleb

 

[swankmetal]

btw, sounds like a really cool rig ya got.



dave

 

[bgilbert]

Yeah really sweet rig, from your pics it looks like you are really trying to kill it LOL. Toyota and 4BT Cummins a sweet combo.

 

[tugboatphil]

There is another option. Don't replace it. Greenleaf took the one off mine and we plugged the holes. To put it in his words, "Gosh. It's amazing how many parts you can take off these pumps and still have them work. "



Hope I didn't reveal any super duper secrets, Scott.



The arrows point to where the tube ends should be.

 

[dieselcruiserhead]

Interesting... I now have it turned up quite a bit and rode shotgun for the first time tonight in a while (exhaust is on pass side unfortunately) and didn't realize how much smoke it was actually putting out. Only thing is it still doesn't feel like it has as much "top end" as the rest of the curve, so I was thinking maybe the hose is expanding under boost; I have the star wheel all the way in too...



Anyway, I might come up with something more substantial but it should work I suppose... Thanks guys... Also thanks for the comments, yes I'm definetly having fun beating the snot out of it and I love it, takes a lickin but keeps on tickin. . That's what's also neat about the old Land Cruisers... About two years ago I attempted to restore it and have quite a bit of rust coming back so I have basically given up on attempting to salvage this body, so with a new one that I'll be picking up shortly means that I'll have even more fun with the truck until it's either dead or I pull it apart to build a nicer (and quiter one - sound proofing is what's missing here)... It actually runs and works great with the setup and I drive it quite a bit for road trips, etc... The idea was that it would be a good DDer but it is unfortunately loud and rattly and somewhat rough but is still a great rig...

 

[dieselcruiserhead]

Here's a photo of the Cummins setup. I'm sure you guys have been through this, originally it was a metal line (which of course can break easily) so Cummins replaced it with this flexible stiff plastic tubing...



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[PToombs]

I think Dpuckett makes hose replacement kits for the AFC. You could pm him and ask. I thought I saw them in the classifieds or someplace. I will do like swank and make my own deal when mine goes.

 

[TKingsbury]

Do a set-up like swankmetal. Just go to Napa and buy a short piece of 1/8" synflex tubing and two 90deg 1/8" pipe to 1/8" compression fittings and put'em on. Shouldn't be more than $5 or $6.

Travis. .