Re: FASS Fuel System Install Reply #50 – June 12, 2024, 05:56:49 pm Quote from: fatheeler – May 29, 2024, 06:31:47 pmMine runs through the cooler in front of the cac then back to the tank, can't find any info on this onlineThanksMikeI think running the return fuel thru the cooler before returning it to the tank is best. The temperature differential of the hot fuel and the air is greater than cooling the fuel coming from the tank.Tim Quote Selected 1 Likes
Re: FASS Fuel System Install Reply #51 – June 12, 2024, 08:44:35 pm If it can be done running the fuel from the cooler to the ECM then to the tank would extend the life of the ECM. Quote Selected 1 Likes
Re: FASS Fuel System Install Reply #52 – June 22, 2024, 06:52:45 pm Quote from: Pamela & Mike – May 29, 2024, 03:40:16 pmOne thing I need to input at this point now that different engines have come up. Scott (dsd) and myself have found out that sometime during the engine upgrades they changed the routing of the fuel flow. To expand on this our '97 M-11 and several others that I am aware of the fuel comes from the fuel tank, through the primary filter, to the ECM cooler, then to the 2ndary fuel filter, and on to the engine fuel pump. All unused fuel is returned to the tank, some coaches straight to the tank and some went through a cooler mounted in front of the CAC. Scott has found (he can expand if I am mistaken) some coaches the return fuel to the tank goes through the ECM cooler after it passes through a cooler that is mounted in front of the CAC. So to be sure what set up you have you will need to do some snooping around on your exact coach.MikeSo installed the FASS on my 2001 U320.FASS INDUSTRIAL SERIES, DIESEL FUEL SYSTEM, CLASS 8, SEMI, 165GPH, (16-18... Using the 165IND which the small line to the OUTLET of the ECM cooling plate to the Factory fuel cooler. The amount of fuel returned through the small line isn't a lot and I couldn't justify installing prior to the ECM plate. It does spit with air as it is exhausted. Will be curious as the amount of fuel returned to the tank. Currently my tank is over fuel and I dont dare remove fuel caps. I will check next week for a visual indication of fuel returned. One thing I did notice is that my last start a week after the install reminded me of my Honda DelSol. It has never started so quickly. I swear it fired on the first compression stroke. Generally takes two revolutions to start. Hum something is different. Currently no pressure indications but will follow up with that next month. Quote Selected 6 Likes
Re: FASS Fuel System Install Reply #53 – July 06, 2024, 12:48:43 pm So I did install and it worked perfect. Used the existing power from the prior WINN system without issue. It's only used for control power, not the pump. Also noticed that the coach seamed to start better/faster. Anyhow we took of on our North Carolina trip with little concern about it. After we parked at my daughter's house the next day I noticed a new oil leak under the coach. I actively saw a drip from the slobber tube. It in the past leaves about a nickel size spot. This was about 8 square feet. Upon closer examination I could smell fuel. I was so disgusted with every thing I just walked away. It was too close to their house to check the oil level to find it was full of full any way. Next morning pulled coach up a foot and opened engine compartment . Checked oil level as exactly were it was when we left Boulder City. At this point I was able to see that the fuel filter drain on the injection pump was leaking. I may be the only person to have this happen to. Twice. Anyway I forcibly closed the drain with plyers and the leak stopped. Pressurized with the FASS with no issues. I spent the entire prior night thinking I had a seal fail in the injection pump and was already sourcing one. Litterly went from 5k$ issue to free. The drain and the slobber tube are only about four inches apart, but I'm confident I saw the drip from the slobber tube. It rained last night and my forever oil stain that was actually fuel was washed away. Yes owning and operating large equipment can be a stress filled experience. I'm confident as we use the coach more and get more issues worked out it will become better. I had also called FASS to find out if there system could be operated with the pump off. They called me back promptly and said that it was a pass thru system. Would not effect operation being it is pass thru. Quote Selected 4 Likes
Topic: FASS Fuel System Install