47-55.1 S10 rear-tank guys, what did you use for fuel lines?

[b-mac]

49, S10, 5.3, Mustang rear tank.

What have you guys done for fuel lines?

I have the S10 OEM lines.

Have been researching AN fittings.

Guess I want a little "rubber" as possible?

Also, apparently the truck 5.3 has the pressure regulator at the block, so the return runs all the way, and you don't need a separate regulator? Can anyone confirm?

[joedoh]

what pump are you using? s10 in tank?


2 door s10 blazers had the tank/pump behind the axle, metal lines to the pump except the last 5 inches or so that were the plastic lines with the correct pump connections. you could splice them at the plastic or further up with the metal using compression fittings.

if you are using a universal in tank pump you can just use an/braided.

[mr48chev]

I have no clue as to what diameter the S-10 stock fuel lines are but could you cut the stock line where it still lays along the frame rail, slip a flare fitting on it and flare the end and bend up a length of tubing to go on back to the rear mounted tank using the correct connector to connect the two? Same with the return line and vent line if you run the vent to the canister. Neat, orderly and you only have to fab the back few feet.

That way you can most likely get away with using only the amount of rubber hose that would be used on a stock application too.

I don't see the need for AN fittings unless you need them to be one of the cool guys. They have their place but all too many guys just use them for looks rather than function.

[b-mac]

Thank you, gentlemen.

Russ, I knew you would chime in since I never answered you back.

I'm not using the S10 tank or pump (or Blazer).

Here's what I have installed:
http://www.tanksinc.com/index.cfm/pa...rod/prd502.htm

I haven't actually selected the pump yet.

I was considering using one of these for EFI.
http://www.tanksinc.com/index.cfm/pa...rod/prd227.htm

Mr.48, I was essentially thinking what you're thinking. I didn't know if I needed the AN fittings for fuel injection.
I think this is a good idea though, use what metal is there, and switch to rubber to get back to the tank.
What fittings and line would you suggest on these connections?

[mr48chev]

The main fuel line size issue should be if the line will handle the fuel flow the engine needs when you run it hard. Too small of a line will cause it to act like you are running out of gas at wide open throttle due to the restriction. If the stock line is up to it I'd just extend the steel lines back to a spot where I can get by with as short of a length of rubber hoses as works with the steel lines securely mounted. Make sure you use the hose intended for FI on it. Overkill on the pressure that the rubber hose will handle isn't a bad thing and most FI rated hose is designed for ethanol.

[joedoh]

if you are going to splice, maybe consider how many splices you will have, each is a potential leak. I see that tanks sells 25ft sections of black twist-lok plastic fuel line, if using that for feed only has 2 splices (one at the pump and one at the fuel rail) and 25ft is enough to run both supply and return, it might be better to do that instead of two sections of metal with short sections of rubber joining them (twice as many potential leaks).

just 2 cents worth.

[Black93GT]

Call me lazy but I used the S10 lines. I mean, GM already did the hard work the hard work of matching the profile of the frame with 3/8” lines.
Once the lines come to my fuel pressure regulator it was all my handy work.

[65blackfleetside]

I am running a 5.3 with S10 frame and S10 tank. I kept the metal OE fuel line and vent coming out of the tank for 2 feet.. Then after 2 feet I used AN fittings and black single braided high pressure fuel line to fuel rail. Corvette filter and external pump mounted on inside of frame.

I can not hear the external pump while in the cab because I went crazy with of all of the duramat and multi layers of carpet insulation- However the pump is quite noticeable when standing outside the truck.

I would recommend anyone building one of these old trucks to use danamatt/ fat matt etc everywhere. Inside doors, on roof, floor pan. Then double or triple roll carpet insulation on floor. I love how quite it is inside now even with my Nast Borla exhaust outside!

If i had to do over I would have spent a little more and installed an in tank pump. At the time I was having difficulty sourcing info on a good in tank pump.

These pumps need to produce at least 50 PSI for the LS3.

Not sure what the stock in tank 4.3 S10 produces?

[jwhotrod]

In this day of crazy fuel supplies and alcohol in our fuel if I was going to build a new fuel system it would be stainless steel from one end to the other. in my streetrods I have put fuel injection in all of them and ran stainless steel and braided hose from one end to the other. primarily because we roam all over the country and do not have any control over fuel supplies. I can run anything from straight fuel to straight alcohol. I will do the same with this truck I'm building, the federal government and the EPA are trying to legislate us off the road by screwing with the fuel, I'm not going to let them.

[b-mac]

Originally Posted by 65blackfleetside

I am running a 5.3 with S10 frame and S10 tank. I kept the metal OE fuel line and vent coming out of the tank for 2 feet.. Then after 2 feet I used AN fittings and black single braided high pressure fuel line to fuel rail. Corvette filter and external pump mounted on inside of frame.

65,

If you're running the 5.3, then the fuel pressure regulator is built onto the side of the block, correct?

[Black93GT]

As far as built in regulator, it should be on the fuel rail.