FI tank fab questions

[MCMLXIX]

Ok. So my friend and I are gonna build a stainless tank for my LS3. I want to have my feed and return connections on the top of the tank. I have 3/8 and 5/16 stainless tube that I will bend, feed thru and welded to my access plate. I need to know if there are stainless steel -6 AN male ends I can weld onto BOTH my feed and return line. I see Ricks Tanks use a femal ends. Is one better then the other? Easier to find? Trying to do this with the leas amount of adapters...

https://static1.pt-content.com/images/noimg.gif https://static1.pt-content.com/images/pt/2008/05/ricks4-1.jpg

Also, I was going to ad a -8 AN bung near the filler neck to vent the tank....

[CarlC]

Aeroquip makes a weld/braze on male -6 fitting.

Since you're using -6 out, why not use -6 return? It would make setup and fabrication simpler.

[MCMLXIX]

I'm using the Corvette filter regulator, so that has 3/8 feed and 5/16 return.... the Walbor in tank pump uses a 5/16 feed... so somehow I need to transition from 5/16 to 3/8 ... for pump to regulator ... I was trying to keep all the fittings -6AN if possible...

[CarlC]

Use a Russell GM quick-connect to -6 male fitting. The quick connect is available in 5/16" and 3/8" sizes. The 3/8" is Russell P/N 640850. The 5/16" is a similar number and available on their website.

You may have to either bend the outboard fitting or file flats in the fittings to make them fit. GM made the inlet/return too close for them to fit nicely. Dorman also makes fittings that use F.I. rated hose that snap onto the quick connections.

For the pump use a short piece (approx. 1-1/2") of fuel hose and some clamps. This is how the aftermarkt companies do it. A 3/8" hose can be used and smushed down onto the pump nipple. Use hose rated for submersion in fuel, not just fuel injection. APE has short (6") lengths of hose available. You may also try to use a short (6") corrugated hose and clamp it to the pump nipple. The corrugated hoses are 5/16" on the ends. The end that goes onto the 3/8" pipe can be expanded to fit by slowly heating the tube end and sliding it over a piece of 3/8" round bar stock that has also been mildly heated. It's what Ford does to fit the hose to the -6 outlet of the previous F250 series of fuel pumps.

I like to use Odiker clamps since they have a much more uniform clamp.

[MCMLXIX]

I got all my pump parts from APE .... here is my thread on the tank itself.... https://www.pro-touring.com/forum/showthread.php?t=68723

https://static1.pt-content.com/images/pt/2010/07/1ad0e1c3-1.jpg

I have the correct black in tank hose as well as a corrugated one... my concerns are 1. tight seal to the pump 2. the fragile nature of the pump niple.

I bought a bender the other day.. and picked up some 5/16 and 3/8 304L seamless tubing... I will have to see how well tubing, hose and other pieces fit... If I can get the 5/16 hose to fit over the 3/8 tubing, that would be the easiest for connecting to the pump in the tank....


I was trying to make it with all AN fittings but the dorman parts on the tank side of the FPR would be the simplest... I wouldnt have to put "ends" on the feed and return line from the tank... just slip some hose over, add a clamp ot two and call it done... Save the AN for the engine feed side with the Russell adapter....

https://static1.pt-content.com/images/pt/2010/07/rus640940_w-1.jpg

[CarlC]

Check your PM's Rich.

I did all AN on both sides of the FPR using a Rick's tank. I can send pics if you need them.

The nipple will seal using rubber hose. When you remove the plastic cap from the nipple there will be an aluminum ring along the end. It acts as a sealing ring and to retain the check valve. The 5/16" hose will fit 3/8" tube, it just takes some lube and muscle.

It is nice to have the hoses disconnect at the tank. Sometimes it's awkward to try and install the tank with a bunch of hoses hanging down. If you decide to go rubber see if you can find someone who can put a sealing bead on the tube.

Typically for your application it requires:

1) -6 female in/out on the tank.

2) Two -6 male/male couplings.

3) Two female 90* hose ends.

4) Appropriate length of hose to reach the FPR.

5) Two hose ends to attach to the Russell FPR adapters.

6) One 3/8" to -6 Russell adapter.

7) One 5/16" to -6 Russell adapter.

8) One C5 FPR.

9) The outlet fitting shown in your last picture.

That will get you to main line. No other filters are needed beyond that if stainless or plastic lines are used. Flush the line with several quarts of fuel, using the pump, by disconnecting the line at the fuel rail.