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1G Fuel Tank return modification?

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SasaniFab

Proven Member
2,433
782
Dec 1, 2013
Mexico, Connecticut
Ok guys so currently Im running stainless 6an lines front to back however for the 6an return im running the return back to the original tank return which necks down quite a bit. Do most of you guys do this or do you cut the line off and weld a fitting to the tank or use a bulkhead fitting?
 
Well I was just thinking what the sense of upgrading the return line when the stock return off the tank is tiny. It's like upgrading your fuel line and keeping the stock filter? Am I wrong ?
 
The stock return works just fine. The bottleneck in our factory setup is the FPR. Someone years ago cut one open to see inside & the passage hole in the FPR is freakin' really small. Searching may find is & there's pics posted as well. The return ID is almost like 10X larger than the size of the hole.
 
I think hes trying to say why do you need a bigger return. Im running 2 pumps in parallel through 6an from the intank pump. No problems with too much pressure
I was just concerned because the factory return bottlenecks down at the tank. I have a spare tank , I was gunna remove the return line on the tank and weld a 6an bung or add a bulkhead to the tank. As of right now im running a 6an line to a barb fitting to the return on the tank. If you guys say thats enough I believe you. I was just reading that some setups request at least an 8an return like the walbro 450.
 
I welded a -6 fitting ontop of my return sending unit. But at the end of the day unless you bore the hole out all the way it's still got that 2" of stock ID, which honestly isnt too far off from -6. My personal opinion is if you're going to mod it at all by welding, might as well do -8feed -8return

I didn't bore my return hole but didn't see any fueling issues up to 38psi on the 6466 with a single rewired walbro450 on gas and on ethanol. But I'm switching to a cell now anyway
 
I've had more an fittings fail on me than hoses and clamps.

You might be surprised how far stock lines and filter will get you. I was trapping 130+ on a full weight street car with stock lines/oem filter walbro 450, afpr, and fic 1550's with Idc's in the high 60's. This was on e85. If I had a lower comp motor right now that could handle leaner afr's I am positive I'd still be on stock feed lines and filter.
 
+1 on the ease of use with an fittings. They're much cleaner and unless something damages the flare (foreign material) or the orings fail ( buy quality fittings) they should never fail.
A fitting designed for aerospace use shouldn't be failing more than a rubber hose and clamp.

Edit: it's been awhile since I messed with a 1g but pretty sure the line is already comparable ID to -6.
 
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