7.3 return line caps

PROFG

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The 1/4" ID tubing is reasonable for a test

PTFE Teflon Tubing 1/4 ID x 3/8 OD FDA Semi Transparent 5' Length
Condition: New

Seller :bsal1608 (519 )100% Positive feedback
Price: US $22.00

Make Offer -Shipping: FREE Standard Shipping
 
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ISPKI

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Most of the cost of the R and D rail is most likely in the machining. Not sure how they get a thru hole all the way through the rail or if they just machine a channel and then bolt on a plate to close it up underneath. Either way, the material is not going to be the greatest cost. Switching it over to PTFE is going to skyrocket the price.

PROFG, what exactly would the 1/4" teflon tubing be used for?
 

Thewespaul

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The R&D rails are drilled from end to end, one from each side. Although 5 years ago when they first came out I saw some machining issues, sounds like the new ones are flawless and much easier to install than before, and for the money you’re going to have a hard time competing with their product especially since people generally are more willing to pay extra money for something billet and shiny. Personally I run Delphi return lines in all my own trucks, and have had the same set on the shop truck on three different engines, if you’re having issues with the oem designed return lines, you got a cheapo kit or you haven’t gotten it installed correctly.
 

typ4

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Like Wes said, I've got a good quality OEM style kit on mine over 10 years no issues, they're either installed wrong or something if there's problems.
 

ISPKI

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Pretty impressive that they were able to drill that piece end to end. What is that, a 6+ inch deep 1/4" dia hole?

I dont think the hose is the actual issue here, there is a wide selection of materials that seal well and stand up to biodiesel easily. The issue that seems to come up are the caps themselves, either poor castings or stubby nipples.

Tygothane and Versilon can both be purchased for 1-3$ per foot and should stand up to biodiesel for...ever. I have been running a C-210-a formula clear tygothane since I bought my truck and it is still clear and as flexible as it was new with no signs of degrading.
 

ISPKI

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I will say that I just received a kit from Wes and the nipples are in fact slightly longer and much tighter fitting than the kit I have on the truck currently which was from a local parts store.
 

PROFG

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The more we have to force tubing onto nipples the more chance of pushing/pulling on cap. Leaks result. Seal should be by clamp, not force fit. jmo
 

Thewespaul

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The more we have to force tubing onto nipples the more chance of pushing/pulling on cap. Leaks result. Seal should be by clamp, not force fit. jmo
Thats why you build each side on the table, then drop them all in together, if youre putting each cap on by itself then pushing on the seal to install the hoses youre going to compromise the seal.
 

PROFG

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To build " on the table" it would seem even measuring each piece and sliding all the way on nipple would give different cap positions due to hose stiffness. Probably does not work perfect the first time. Others could confirm. I only plan on doing it once so do want it perfect first time. Maybe too **** but IF I had a spare head would consider building it on mounted injectors.:D
 

Thewespaul

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To build " on the table" it would seem even measuring each piece and sliding all the way on nipple would give different cap positions due to hose stiffness. Probably does not work perfect the first time. Others could confirm. I only plan on doing it once so do want it perfect first time. Maybe too **** but IF I had a spare head would consider building it on mounted injectors.:D
Its a 4" spacing, just cut 4" hoses and youll have it fit perfect each time, I guess I've just done so many of these I wouldnt think to do it any other way but that might not be completely obvious to someone whos tackling this job for the first time, I have thought about selling a premade kit with everything cut and assembled ready to drop on. Don't know if people would be willing to pay extra for that or not, but I suspect it would lead to less leaks.
 

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