Fuel Line Plumbing?

[camino70]

I installed a fuel injected power plant in my 70 El Camino some time ago and used aeroquip 2556 -8AN for the feed and -6AN for the return. First, I am not sure this was the best choice, so any comments/advice is appreciated.
About 3 inches from the external fuel pump started to spew fuel today. It feels like half of the hose collapsed right there.

I was planning on cutting a foot or so out and coupling in another section, but wanted thoughts on this? Should I replace it all? If so, with what?
TIA!
Ron

[camino70]

Apparently my search and brain were not functioning last night. It looks like my hose took a beating from the ethanol. I plan on replacing it all, but haven't decided on hard lines or teflon, is there a good place to research the pro's and con's? I don't have a bender or flaring tool, should I let this influence my decision?
TIA

[parsonsj]

Ron,

It wasn't just the ethanol, ordinary AN hose isn't rated for long term gasoline either.

https://www.pro-touring.com/showthread.php?62575-braided-fuel-lines-took-a-crap

[ErikLS2]

If you're at all into this hobby a good flaring tool, I have the Ridgid, is a handy thing to have around. Teflon hose is a lot more expensive than aluminum tubing also. I'm running hardline front to back and a short piece of Teflon hose from that to the engine and the fuel tank.

[camino70]

Are there rules for hose size? My fuel pump is 10 AN, but my current deteriorating hose is 8 AN. Should I go with 10?
TIA.

[CarlC]

-8 will be more than adequate. Unless you are running really big HP a -6 is usually plenty.

[camino70]

I wound up getting braided teflon. Can anyone give me pointers on cutting the braided to length and installing fittings?
TIA.

[old66tiger]

By the time you buy the GOOD aluminum tubing, not the stuff that Summit sells, the industrial aeroquip teflon isn't that much more and you will have fewer opportunities for leaks because the good aluminum is usually restricted to 6 foot lengths unless you get coils and have to deal with wavy looking lines.

Here is a good tutorial:

http://www.hydratechbraking.com/hosetech.html

Here is my 2 cents on working with the teflon. Take 3/4" painters tape and wrap the teflon braid 2 or three times adjacent to the mark on the hose. This will ensure that you will get a nice square end when you cut the outer braid and the inner teflon core. Take a dremel tool (not a die grinder) with a thin cut off wheel and follow the edge of the tape around, cutting only the braided portion of the hose. Don't cut the teflon liner at this time. Follow up by cutting the teflon with a sharp razor blade, slicing through the teflon coreas straight as possible. I sometimes use a bench grinder to dress up any imperfections in the brading or the core or to square the end. You could use a file too. Wash the hose out with brake cleaner and blow out the junk that might have gotten into the hose. Clean any burrs off with a small exacto knife. Slide the nut on the hose before putting the ferrule on. Remove the tape and insert the ferrule on the core making sure that no braids are under the ferrule. Use the flat side of a work bench to help with pushing the hose on the ferrule, making sure the hose bottoms out in the ferrule. Take your fitting and chuck it in a vise. Lubricate the threads of the fitting and the inside diameter of the hose with a grease or light oil. I use Aeropuip hose lubricant or you can use a lubriplate or equivalent. Slide the hose over the fitting nipple until the ferrule bottoms out and screw the nut on the hose fitting. I screw the end on until there is about 0.035" clearance between the nut and the fittings hex shoulder. This will give you some opportunity to clock the fitting once installing it on the car.

[Ollie8974]

Check out LS1tech.com
There is a good forum on Fueling and Fuel injection.
This is a link to a posting about using the stock plastic fuel lnes.
http://ls1tech.com/forums/fueling-injection/1085884-nylon-fuel-line-fitting-attachment.html

[camino70]

Thank you all! Aeroquip.cc (where I purchased from) replied to me today that assembly instructions are on their website: http://content.yudu.com/Library/A1qf3q/EatonAeroquipHighPer/resources/index.htm?referrerUrl=http%3A%2F%2Fbukase.com%2Fbu kase.php%3Fb%3D7

Edit: Towards the end, page 50...

Thanks again,
Ron

[camino70]

Can anyone recommend what size support clamps to use? The OD is .43" and .54", the closest clamps are .44", .50" and .56" are these close enough?
TIA,
Ron

[Ollie8974]

Those should be close enough.

[camino70]

I need troubleshooting advice on this install.
My car now won't start and doesn't seem to be getting fuel through the injectors. I pulled the injectors and they don't appear to have any fuel at the nozzle, should they?
There is fuel through the rail.
The inside of my old fuel line looked terrible, could this deterioration have caused failure with my injectors?
When I cut my new lines I cleaned the ends well, but did not flush the entire line, did I leave garbage in there causing my injectors to fail?
I don't see anything in the injector head, but didn't think I would? Is there an at home way to clean them? Is it worth sending out for pro cleaning?
When I buttoned everything up, I ran the pump for 15-20 minutes without attempting to start, my thought was it would flush any garbage back to the tank and filter.
Any thoughts on where to start? I have another set of injectors that are 32lb/hr, car is setup for 50lb/hr. Do I throw them on and see if I get fuel through them?

TIA,
Ron

[camino70]

I replaced the injectors with the 32's and it started almost immediately. The chip isn't setup for these, so it wasn't idling well.
Off to the local injector guy. I am still open to criticism and/or advice. I would like to at least learn from this.
TIA,
Ron

[Ollie8974]

I need troubleshooting advice on this install.
My car now won't start and doesn't seem to be getting fuel through the injectors. I pulled the injectors and they don't appear to have any fuel at the nozzle, should they?
There is fuel through the rail.




When I buttoned everything up, I ran the pump for 15-20 minutes without attempting to start, my thought was it would flush any garbage back to the tank and filter.
Any thoughts on where to start? I have another set of injectors that are 32lb/hr, car is setup for 50lb/hr. Do I throw them on and see if I get fuel through them?

TIA,
Ron

The inside of my old fuel line looked terrible, could this deterioration have caused failure with my injectors?
YES. The hose would be deteriorated along the entire length not just at the point where the leak was.

When I cut my new lines I cleaned the ends well, but did not flush the entire line, did I leave garbage in there causing my injectors to fail?
Cleaning the ends of the new lines should be OK

I don't see anything in the injector head, but didn't think I would? Is there an at home way to clean them? Is it worth sending out for pro cleaning?
I would send them to a pro. There are injector cleaners you can use but to get aal tthe crud out they need a professional cleaning

[camino70]

I took the injectors to a pro and got some not so good news. Flow rates are all over the place and two respond erratically. There was a ton of trash in the injectors baskets. It may be time to up the 50's to 60's.
I've drained the tank, replaced the fuel filter and cleaned the fuel rail when I pulled the injectors, any other ideas?
Ron

[CarlC]

You may want to consider putting a filter just before the fuel rail.

[camino70]

Not a bad thought, I think I am going to do it.

[diesel25lrs]

-8 will be more than adequate. Unless you are running really big HP a -6 is usually plenty.

Carl,
What would you say the RWHP cutoff is for the -6 line before bumping up to an -8?

[CamaroAJ]

Carl,
What would you say the RWHP cutoff is for the -6 line before bumping up to an -8?

there are people that run 1000rwhp LSx engines on 3/8 fuel line. its about the pump more than the line.