Fuel Line Routing, Return into feed?

[Darkbloodmon]

S&B tanks designed a stupid return feature advertised for aftermarket lift pumps (its not. this a feature for their bed transfer tanks to feed too, it's a marketing gimmick to call it an aftermarket pump return feature) In their CCSB 52 Gallon tank that I have. The mass flow return coming off my fass is routed into their half inch return port on "top" of the tank. As the fuel level goes down the aeration goes up as it waterfalls from a farther distance.

I was wondering if this is a sloid idea. I'm of the mind to T or Y the mass flow return into the feed line from the half inch sump port at the bottom, and reinstall the plug for that port.

Any foreseeable issues/recommendations with flow or pressure? I'm not looking to put any holes in this tank to re-route it.

 

[AH64ID]

Aeration isn’t nearly the issue that some fuel pump companies want you to think it is.

I wouldn’t give it a 2nd thought.

 

[Darkbloodmon]

Aeration isn’t nearly the issue that some fuel pump companies want you to think it is.

I wouldn’t give it a 2nd thought.

The fuel slosh is an issue though, it doesn't take much at a quarter tank or lower to feel the engine stutter on hard acceleration. I'd like to keep the fuel closest to the feed as possible. I'm at a loss for words why they didn't put a dual port in built in sump to return to next to the feed.

 

[AH64ID]

The fuel slosh is an issue though, it doesn't take much at a quarter tank or lower to feel the engine stutter on hard acceleration. I'd like to keep the fuel closest to the feed as possible. I'm at a loss for words why they didn't put a dual port in built in sump to return to next to the feed.

What are you running for a pickup? Draw straw or OEM
canister ?

I am not aware of any setup that returns to the bottom other than OEM.

 

[Darkbloodmon]

What are you running for a pickup? Draw straw or OEM
canister ?

I am not aware of any setup that returns to the bottom other than OEM.

Fass Titanium is feed by a half in line coming from a half inch port at the built in sump of the S&B tank. The mass flow return is at the very top of the tank.

There is not a factory feed on this setup, the only factory line left is the return from the back of the head going into the sending unit.

 

[AH64ID]

Ditch the optional sump and go back to the OE basket.

It says right on their website that the sump won’t cure the 1/4 tank issues, which is what you are experiencing.

 

[Darkbloodmon]

Ditch the optional sump and go back to the OE basket.

It says right on their website that the sump won’t cure the 1/4 tank issues, which is what you are experiencing.

They didn't have a webpage for this product listing the features when I preordered before R&D was finished. I am not replumbing my fuel system for an OEM setup, The only thing left from the OEM setup is the factory return from the head. Everything is on a Fass lift pump with 1/2" lines.

Are there any foreseeable issues with a T or Y into the feed line from the mass return port on the Fass?

 

[Ozymandias]

Return into feed sounds not really appealing to me as that would feed the separated air from the FASS into an endless cycle, accumulating in that circuit instead of disposed back into the tank.

 

[Darkbloodmon]

Return into feed sounds not really appealing to me as that would feed the separated air from the FASS into an endless cycle, accumulating in that circuit instead of disposed back into the tank.

Makes more sense the flow would be irregular, is there such a think as a double barbed fitting with threads at the base on one side? I was thinking if I could use the barbed potion to attach a hose or tube to sit inside the tank on the bottom and then thread it in and attach the 1/2" return hose to the exterior barb fitting.

 

[BigPapa]

You mean something like this?

Amazon ASIN: B08DXJXBYL

 

[Ozymandias]

It's called a bulk head fitting.

But you are really overthinking that issue, the fuel sloshing around in the tank while driving gives way more air into the fuel then your return from the FASS.

 

[Darkbloodmon]

You mean something like this?

Amazon ASIN: B08DXJXBYL

View attachment 128781

Exactly! Thank you.

 

[Darkbloodmon]

It's called a bulk head fitting.

But you are really overthinking that issue, the fuel sloshing around in the tank while driving gives way more air into the fuel then your return from the FASS.

The point is to keep more fuel on the bottom, Sure it wont stop the issue I'm having completely but it will help alleviate some of it no?

What would you recommend? Keep in mind I'm not re-plumbing an OEM system or fuel basket. I rather like the idea of the bulk head fitting, that or a Y barb threaded into the 1/2" port at the sump on the bottom; I think keeping the return closer to the feed and the tank would be better for flow than having it father away inline somewhere else.

Yes I over think things. I use anti seize like I live in the rust belt and thread locker like I don't trust a torque wrench.

 

[AH64ID]

You're not going to get anything to fix the sloshing issue short of a OEM basket. It doesn't matter where you plumb the return to as the pickup will still be able to suck air during sloshing.

 

[Darkbloodmon]

The more fuel on the bottom of the tank the better. I'm not looking for a perfect solution just a better one than designed. Top of the tank is near 2' at the return port, you don't pour drinks from 2' above the glass. The faster and more controlled fuel can be returned the better, I don't disagree that it may be fractional but I disagree to say that it won't help at all.

I appreciate the feed back and discussion

 

[AH64ID]

If the entirety of fuel is moving like a wave pool then a small constant stream from any level won’t work to fix what you’re after.

There may be a way to improve the return, but it really doesn’t matter as it only takes a little air to mess up the suction on the pump.

 

[Tuesdak]

The main reason OEM's return fuel to the basket or the bottom of the tank: is to keep BOTH lines submerged in fuel. When you shut off the engine a return line open to the air at the top of the tank can allow the fuel to siphon out of the injection system over time. The next start is a "purge the air" long crank. Air leaks in the system can do the same thing.

X2 you don't put the return fuel with purged air back into the fuel pickup. It would never prime... There has to be a way for the returned air to leave the system.