[alco33]

Hello. I have a HFS-3 in a 2004 Toyota 3.4L with a Magnuson supercharger (8-10 pound boost) and UDR 7th injector system, headers etc.etc. After install of the HFS-3 with all system checks everything worked perfectly. Went next to dyno guy for a tune and the truck ran Great! ... for a couple of weeks as a daily driver. For no reason whatsoever the gauge bargraph stopped showing any flow. The S is still lit and the pump is running. Full throttle causes the HBE lite to come on and the water level light as well, even when the tank is full. The first time I had this problem I went through the install check list and system checks to discover no flow from the nozzle... I thought plugged nozzle? but no, put it on the bench with a 55psi fuel pump and it flowed just fine. Reinstalled the nozzle on the truck and the system started working again! Figured it was plugged and I dislodged the dirt somehow and called it good. Thought it was a bit strange that there was dirt in the system as it had been flushed and has an additional full-flow Earl's fuel filter installed (designed for alcohol dragster). Now a month and three tanks full gas later the problem is back exactly like before. This time checking the pump, and jet make no difference. I've checked for air in the system and changed the jet ... I suspect the switch/FAV but thought I would ask you guys because there is no telling when it will magically start working again. I'm glad the average temperature is in the 30s (F) as the system doesn't have any fail-safe map switch over available. But there is no sign of knock as long as I drive without WOT or allow it to bog. Probably must get this figured before summer tho as here in Nevada at 4500' altitude it does get to 100+F and the best gas available is 91 octane. Your advice is really appreciated. Thanks!