12/3/2023 0 Comments Fuel surge tank plumbingSome folks had success routing the fuel lines above the tank, moving the line towards the center hump, and then pushing the fuel lines rearward so they pop out near the Ebrake pipe. My first plan had been to tap into the fuel line at the pump. This car is a late model and it’s fuel filter has been moved to the engine bay. The act of cutting makes the braid fray and then it’s hard to put on a a Push-Lok Tape on the hose before you cut it helps. Since it too was a barb fitting, It needed a hose clamp. In order to mate the two I used 3/8th hose, or call it 6AN hose, and used a 8AN to 3/8th barb at the tank. Get one that people are saying nice things about.Ĭonnecting the bulkhead fuel in (6AN) adapter to the surge tank’s 8AN inlet was the one departure from using AN fittings. Since they were barb fittings, I put on hose clamps.ĭon’t risk a weekend by going cheap buying a POS aux pump. So in order to create a little mechanical isolation between pump and tank, I connected the two with 8AN barb fittings an a short piece of 1/2" SS hose I had laying around. The short piece of AL tube would have to deal with it’s two ends vibrating in different ways and that seemed like a lot of unnecessary stress on the AL fitting. I decided that it was a bad idea to rigidly connect the surge tank and pump. One plan that was discarded in the last hours of this effort was that solid AL elbow. In the pic above note the 90deg elbow, upper right, that is not connected to anything. AN Hoses and Fittings Guide - Kanga Motorsports Only after ordering it did I figure out how to put them on hoses such that no tool was needed. I was confused enough about this that I bought an expensive tool to install Push Lok fittings. But then I did some reading and realized that Push Lok was better and that it was just a matter of knowing how to fasten them to hoses. I had problems connecting them to hose and almost switched to all barbs. At first, I didn’t understand that these were different then generic hose barbs. That’s important because if I had just bought a 8AN fitting, it would have been too big for the 3/8" hose. In order to get the 3/8" hose to fit on the surge tank’s 8AN port, I bought a 8AN to 3/8" barb. That went happily to the pump because it had a 6AN outlet. On top I used 6AN fittings and 3/8" hose. The pump inlet was 18mm tho and that required a couple different tries at adapting so something more useful. Buy some 8AN plugs, but don’t buy anything that’s gonna want 1/2" hose. –The surge tank has 8AN fittings, but 8AN hose is 1/2" dia with is silly big. Some folks will say that 8mm isn’t 5/16th, but it’s close enough for me. Finally, I wanted to stay clear of the rear sway bar fastening point. Also, as it became clear where the fuel lines were going to penetrate the trunk floor, it was obvious that I needed to keep the hardware kind of distant from those holes so hoses had space to make graceful turns. I wanted some distance between the surge tank and the horiz bar, I wanted to keep hoses away from where things happen like putting a spare tire in the tire well, and also the spare parts bins live in the trunk between events. There were some constraints that had to be worked around. The AL sheet is fastened down at 4 points. Instead of trying to fasten a bunch of things thru the rear sheetmetal floor, I used a piece of relatively thick AL sheet as the base for it all. I didn’t like the spare tire well solution because not only is that a convenient place for ballast, but it’s also part of the car’s rear “crush zone” and I wanted the surge tank more protected. All the surge tanks were either between the rear shock towers, or in the spare tire well. I requested pics of surge tank installs on fb to see what others had done. If you went with the small surge tank route, I’d adapt 1/4NPT to 6AN and drive on. I bought the big one with 6AN fittings, but the small one with 1/4NPT fittings would have been adequate. Fuel Accumulator – Ireland Engineering | Racing & Performance Parts for BMW & MINI I started with this inexpensive fuel surge tank. I learned a lot along the way about hoses and fittings. The track has fast left and right hand sweepers that stress fuel and oil pump pickups. This car is relatively new to me and I had never had it at Roebling before. I had some symptoms at Roebling last month that seemed to be fuel starvation.
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