Thread: Running extremely lean?

feed is the same 5/16

Think it will help any??? Lol

I would put money on it. Replace both lines with the size Unijabnx2000 said.

To better understand, there are two primary types of fuel systems. Dead head and return. Dead head is when the fuel run to the fuel rail/ carb and the fuel pump limits the fuel pressure. A return system is what we use on our cars. The fuel pump supplies the same flow no matter what, and the fpr regulates the pressure. What you were doing using the smaller line was increasing the fuel pressure by limiting the flow back to the tank.

I think everyone is on the right track with the fuel issue.

About the MAF inside, that is fine. As long as the air flow is laminar through the MAF you should be okay with even 10 feet of hose between the MAF and the TB.

It's not a smooth tube on the inside that hooks up to the Tb and maf its like a heavy duty shop vac hose. It's not exactly a shop vac hose although I am some what of a red neck I pulled it off another car from the junk yard. It's kind of hard to find a custom fit hose that does a 180 and then a 45 through the fire wall.

When I ran my original lines that were 5/16 gm high pressure plastic I though the barbed fittings were going to make a difference seeing as though they looked restrictive. Also the reason for the flex tube is because rules are that it has to be a stock air box with out any aluminum tubing connecting the two or I would have already broke out the tig welder!

If the maf is still connected to the stock air box, then the corrugated hose should not matter since it is after the maf. Yeah, it may create some turbulence, I can't see it causing the problem you are having.

For the fuel line, I am assuming you are using a fuel cell? Get some of the high pressure rubber fuel hose from any parts store. Since the fuel lines are passin through the bulkhead, either make sure the hose is protected, or install a bulk head connector.

The corrugated pipe or tube if you will is connecting the maf to the tb. I ran 3/8" steel for the feed and 5/16 steel for the return today haven't fired it yet but I will in the am.

Stock tank btw that's the rules too.... Stupid. I would rather run a fuel cell but rules say if the stock tank is before the rear "axle" then it has to stay.

Update time! Changed the fuel lines feed is a 3/8 " and the return is a 5/16 man what a difference!