Fuel Line Question

[DSMpwr25]

I am close to the end of my project and i am on fuel right now. So I am going to run 6-an SS lines, from Fuel Filter, to Fuel Rail, then to AFPR, then back. I want to buy the lines and fittings and do it my self. Does anyone know how many feet of the SS line I would need?? Thanks for the help always

 

[1stGenRocks]

How many feet of line you need all depends on where you mount the afpr. Just go out to your car and measure to where you going to mount it. Remember that the line will be pretty bulky and can't do sharp bends. You also don't want it to rub on anything because it will cut through it.

 

[DSMpwr25]

It will be firewall mounted, but I was just wondering if anyone knew off the top of there head. thanks tho

 

[project_tsi]

I used about 15 feet approx running from the tank to the filter to the rail. I think a little less than 15 feet so to do the retrun also 30ft should be plenty.

 

[atc250r]

Since #6 is 11/32" and only 1/32" bigger than the stock 5/16" line why not just step it up to #8 line feed? Personally I don't see the reasoning behind going through the trouble of installing a line that is only 1/32" bigger than stock.

John

 

[project_tsi]

Since #6 is 11/32" and only 1/32" bigger than the stock 5/16" line why not just step it up to #8 line feed? Personally I don't see the reasoning behind going through the trouble of installing a line that is only 1/32" bigger than stock.

John

-6 in my experience is closer to 3/8" so it isn't a bad upgrade, and its been show to provide enough flow for 700hp easily w/ more to go. Shep runs -10 I belive. But I don't know his exact reason for the change, but its possible the stock lines could have been rusted through and leaking, thus needed replacing, not to mention the SS lines and fittings look great. Also it allows him to easily run a high flow aftermarket filter. If you didn't know, the stock filter is one of largest restriction in the stock fuel feed lines, right after the restrictive banjo bolts.

 

[silkcity100]

you would need 3 to 4 feet max,did it myself also still have a little left

 

[RoasT BeeF]

Since #6 is 11/32" and only 1/32" bigger than the stock 5/16" line why not just step it up to #8 line feed? Personally I don't see the reasoning behind going through the trouble of installing a line that is only 1/32" bigger than stock.

John

Incorrect. The stock line is 3/16" whereas the -6 line is about 5/16" depending on the brand.

Also keep in mind that it was found that from the fuel pump outlet to the fuel rail inlet fitting, @ 60psi, a flow of 1.9 liters per minute could be measured. When the pressure was increased to 75psi, the flow only went up by 0.1 lpm. That's only ~5% more flow for a 25% increase in pressure... not good. Couple that with the fact that stock injectors are 450 cc/m so that four of them can approach a flow of 1.9 lpm (4 x 450) , it can be seen that we are approaching the point where the injectors can outflow the fuel system.

When the entire feed line is replaced with -6 from tank to rail it has been shown to flow ~10 lpm @ 60psi which is a considerable increase. Keep in mind this will also vary depending on the fuel filter used. But a nice upgrade none the less.

There is not really a need to run -8 an line either, as the -6 can supply adequate flow for up to 1000cc injectors.

 

[bastarddsm]

well said. -8 is just huge. A budy of mine has an 8 second alcohol injected roadster that only uses -6 from the pump. and thats alcohol which requires about twice as much fuel