ok so correct me if im wrong im getting your double pumper from mike next month for my build do i need to do anything special. im not really understanding this fuel pressure drop you speak off. I will not be installing it the shop thats putting my car together will. just want to know if there is a new version of this double pumper system or something i need to do to the kit first or just install and go and leave it at that.

 

Did you use stainless or aluminum? Sorry, first post it says SS 3/8" and then above it says aluminum.

Just curious since raw aluminum is supposed to be trouble with the ethanol and I don't know how many aluminum components were in your previous fuel system.

 

i think the stock line is 8mm.

 

edit

 

Mike will know what to request for your double pumper. Nothing special needs done, there is nothing new. There are questions and comments being made I think to get the pot stirring but I am answering them anyway.

I also think the stock line is 8mm/5/16" as I've measure it before. I'd like to check the wall thickness on it though and then see if the entire OD of the stock line will fit inside the new line I installed.

All of this is off the topic of the point of this thread and video BTW. Not that I mind.

The point though is how well the stock parts, tank and our double pumper components have held up to many different types of fuel.

 

Sorry 03white, I used stainless steel coiled line. I fixed that

 

Sorry if it was off topic and I wasn't trying to stir the pot. I haven't seen too many people do hard lines so thought it was interesting you did. While they are a ***** do do, I think it's a far better way than running braided hose.

 

I did a twin 044 surge tank setup fed by a single walbro on a 240sx (w/2JZ)... and I used stainless steel tubing that was straight and was .030-.035" thick.

I bought it from www.onlinemetals.com I've done -10AN setups this way and -6 setups.

VP Import is corrosive and will eat your fuel tank. I've seen it with my own eyes. Not only is VP import this way, but trick 114 Leaded is also very corrosive.

Also from some experience in making triple in tank setups for Supras... I would recommend you use a lead insulator between the pumps. It helps shield the electromagnetic drives inside the pumps from each other. I forgot who we used to buy that stuff from... some supra shop.

 

Now that isn't a comment you see every day!!
It shouldn't have to be lead though

 

Found it... Powerhouse sells it.

http://www.horsepowerfreaks.com/sale...Pump_Shielding

 

but if there isn't a problem, why go through the hassle?

 

03white, you were not who I was referring to.

R/T, my car had VP Import in it longer than any other fuel I have used, I'd say close to 2 years of nothing but Import in it, sat all winter long. My tank is showing different results.

Also, pump failures or problems are so low I don't see the need for the insulator. The biggest problem with the pumps being together is the torque of the clamp and where the clamp is placed, it will actually slow the pumps down and can completely stop them.

I came in this morning and cut/deburred a fresh piece of the stock line and the 3/8" line I used. Here are the dimensions:

Stock line is .315 OD/.255 ID

New SS line is .376 OD/.315 ID

This means the line is 23.5% larger than the factory line. When I first looked at them I thought to myself, "What a waste of time, good thing the stock lines were ruined." Then I sat down and did the math and a near 25% increase in line size is substantial.

Knowing the single stock line on E85 has made 700 whp on our dyno tells me that it's good for about 900 on gasoline (figuring in 30%). Another 23.5% on top of that should put this single line at 1100 hp on the 3/8" line which is right inline with what I've been told by Kinsler and Weldon.

As I said, stock single factory line is good for 99% of the EVO's running.

 

Between my friend and me, we went through a 55 gallon drum of VP Import and a few baby drums. When I first saw Lucas post about the corrosion issue, I was concerned. I'm glad to see Dave thinks otherwise.

What I'm curious about, is how people know VP Import is the cause, when finding a corroded tank? Tanks can corrode for a number of reasons, and I'm not sure the people saying Import is bad, know for sure it was the cause.

 

On the drums of Q16 and Import it warns against leaving the fuel in your tank actually, so they must think something's up with it too. In my case, it has not caused any problems.

 

Look at the msds on q16.

Dave b, you need to weigh the factory lines with a precise scale to determine if the fuels are damaging the factory rubber lines in the tank.

Dave, although I agree that you can make 600+ whp on the stock lines... I think that there will be significant standing fuel pressure waves in the lines and in the rail.

Only reason I say this is because I'm not convinced it's worth the trouble to run small diameter lines.

If you don't believe me you can instrument your rail with several kistler high speed pressure transducers @ 5k a pop and find out for yourself.

I know Tony palo has done his own testing on this and might be able to further compliment my case for larger lines.