|
Unusual fuel line question I am currently using the stock tank with a sump. Sump has 2 1/2" bungs, currently using 1 with 8AN fitting (running 8AN to the front). This is an EFI car so the stock sending unit has the 4 ports. Still using the stock vent, using the original feed line as a return and the other two are looped together with hose. Now for the question. I need to upgrade to a 10AN feed and an 8AN return. I am going to use the sump with both ports feeding an external pump and then go forward with 10AN. The return is the issue. I was thinking of bringing an 8AN line back to the stock tank and then splitting the line into the stock feed and return lines. And then using the last remaining port (that originally went to the charcoal canister) as a tank vent. Does this sound like it would work or should I just get a fuel cell? |
Re: Unusual fuel line question Really? A 10AN feed line running the full length of the car? That's a lot of fuel to move from the back of the car up to the front especially during acceleration. An 8AN is more than enough unless you're making some 2500+ HP engine. I use a 10 AN from the front mounted fuel tank to a belt driven pump and even then, the pump only has a 1/2" inlet and 3/8" outlet ports so there's only so much fuel that can be moved through the ports. Fuel line is about 2 feet long. From the pump a 6AN goes to a barrel valve to feed the 8 injectors through 3AN lines. Anything the engine doesn't want is fed back to the inlet side of the pump through another 6AN line. That's feeding an estimated 800 HP altitude corrected engine and running alcohol. I'm using about twice as much fuel as a gas engine does and my fuel lines provide more than enough fuel for the engine. |
Re: Unusual fuel line question This is on a n/a 434 making 930 @ 8000 rpms with 83lb/hr injectors. With 8AN feed fuel pressure starts to fall off above 7500. |
Re: Unusual fuel line question OK but you may need to use a bigger pump also. Like I said, that's a lot of fuel to push from the back to the front under acceleration. |
Re: Unusual fuel line question i had basically the identical setup. sumped stock tank with 2 1/2" ports tee'd into -10, which fed a filter, then pump, then another filter, and then i had a check valve. -10 ran the rest of the way to the front. -8 return, and i had that going into the 3/8 line on top of the tank. my thought was the smaller 3/8 line size was only a few inches, so not that much of a restriction. i used the stock return for a vent i think. i was planning for a turbo setup with around 1k whp but never wound up getting it done. instead, it was a fairly mild 350 with nitrous. |
Re: Unusual fuel line question sounds like a fuel pump falling off. as the need for fuel is more then it can keep up with.. think of it like this... fuel need is a leak... the more needed is a LARGER Hole in the line.. the larger hole in your fuel line..fuel pressure starts to fall off...its better to run rich..then lean.. a good pump and reg.. can go a long way to fixing some simple things..this pump runs a tad over $700 ea.. (summit) and is a bit over kill.. it fits 12AN lines and can keep the line presser at 70psi..(90psi in there adds) .. so if you want to run a garden hose to your feed.. with a return.. give it a shot... https://i.postimg.cc/LXmdj9sc/20170429-194225.jpg.. There are other pumps out there..this is just an expel https://www.summitracing.com/parts/aei-11102 |
Re: Unusual fuel line question a single a1000 would probably fill the need if its n/a. and really, like arctic said, i think i would give a new pump a shot before changing everything up to -10. i would think the -8 would be enough? |
Re: Unusual fuel line question check out the monster fuel reg with 10AN fittings... https://www.summitracing.com/parts/aei-13134 also when doing all this fuel upgrades use a fire suppression system...as this stuff saves Cars Lives... |
Re: Unusual fuel line question Instead of trying to re-use the existing feed/return/vents in the stock sending unit, wouldn't it be easier to remove the sending unit and modify it for whatever you need? The tubes are just soldered into punched holes. Easy enough to remove the old tubes, use a tapered drift to enlarge the hole, and solder in a new line that fits your needs. Or fab a new insert and use a bulkhead fitting of some kind or other. |
Re: Unusual fuel line question So after talking with the engine builder and chassis guy, we decided to put a cell in the nose and run a holley 12-1200 fuel pump 12an pickup, 10an to regulator, 8AN return to cell. thanks for all the posts. |
Re: Unusual fuel line question Looking at doing this exact same thing Fastbird, Are you mounting it in front of the radiator or mounting a smaller radiator and mounting them side by side? Was wondering if they (nhra) would squak at me having on in front of the radiator beneath the nose. |
Re: Unusual fuel line question I'll post pics once its finished. Chassis guy is going to remove the front bumper and nose support system, fabricate a 3 gallon cell in front of the radiator, build a safety structure around it and then make a skeleton out of small diameter chromoly to support the nose cone and tie the frame horns together. |
| All times are GMT -5. The time now is 04:10 PM. |
© 2024 MH Sub I, LLC dba Internet Brands