Ok. So after speaking with Lost Racing about my Earls 175GPH filter collapsing, we have come to the conclusion that possibly my existing fuel hose (or something in my fuel system) is being eaten by the e85, then clogging the filter and then collapsing due to limited flow. As said, im pretty regular about changing out the filter. And that was the 3rd filter cartridge Ive put through it with rather limited KMs. The filter *should* easily flow more fuel than my injectors demand, and my previous pump could flow. (4 x 1000cc injectors X 60 min = 240 LPH at base pressure. DW300 = 320 LPH at base pressure. Filter 175 GPH = 662 LPH. obviously doesnt take into account 1.5bar of boost pressure on the fuel rail pressure, but even still, without doing the math, it should still flow ample amounts of juice) So the filter should flow plenty of fuel for my demand. So there should be no reason for it to collapse other than premature clogging? (perhaps thats why my last DW300 died???)
Let this be a warning to anyone running dedicated e85. Id double check all the hardware is acceptable for e85, and also do very frequent filter changes. Lost Racing also suggested to run an upper cylinder lube mixed with the fuel. Or even a castor oil mixed with the fuel. Or given that my car only gets used once a month, they suggested flushing the lines with PULP 98 after use.
So, with that in mind. I bit the bullet on new fuel delivery hosing and hose ends. (i had to change hose ends aswell as my existing standard cutter style AN hose ends are incompatible with the Speed Flow special teflon hose. I went with the Speed Flow 200 series hose and hose ends. All up i needed 2m of hose and 12 straight hose ends. One nice benifit of having an integrated regulator in the surge can, and a return-less system is it saved me a couple of hundred bucks worth of additional hose and fittings. The other benifet of the return less surge can is the filter now only has to filter the fuel the engine actually uses, not all the fuel that would bypass from the reg aswell.
So here is the new hoses made up. The 3 short hoses are from the hardline to and from the surge can and also up to the filter. The 3 longer hoses are from the fiter to the splitter block, and then down to each rail. I really liked the assembly of these hose ends over the conventional style. They are a little bit more compact, are very easy to assemble. (just need to remember to fit the tube nut BEFORE spreading the braid and inserting the olive) And the -6 teflon hose is alot smaller outside diameter which is nice.
Also note the old filter cartridge collapsed and full of grey stuff. Atleast with a cartridge style filter, you can see the inside of the system, unlike a regular inline filter which could hide a failure like this inside.
And lastly. See here for the location of the Rdium surge tank. This is looking in from the passenger wheel area.
