lcottrell
Joined: 29 May 2006
Posts: 1494
Location: Jordan Valley, Or
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 Posted: Thu Feb 01, 2007 8:08 pm Post subject: tanks again, EIS |
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After the last go around about the tanks, I drilled out the vent holes to make sure that they were not plugged. Then I made the lines from the tanks the same length. Gassed up and went to the Alvord to see how they were going to act and to get some idea of a fuel burn with the 503. This time I kept the throttle at 6000 RPM's or as close as I could get. My earlier unofficial tests at 5400 seemed to me to be about 15 mpg. I am doing all this because Arty and I are planning to fly to Texas this spring and I really need some hard figures on fuel consumption and the reliability of my fuel system. Unfortunately I didn't check to make sure that both the lines were pulling and I was experiencing a drastic reduction in my front tank and none in the back tank. I landed on a dry lake bed and found that the fuel lines on the back tank was not flowing. I took it off, got a mouth full of gas, plugged it back in and headed back home. When I arrived back at the hanger the fuel levels were the same, so it did equal out. I checked the mileage and found that I for sure got 15 miles per gallon. 60 miles- four gallons of fuel. One of the biggest reasons that I had plumbed the two tanks together was because the fuel gages that I had last year were both belly up, and I was using the "aux" off the EIS to monitor the fuel in one of the tanks. That left me with one tank without a monitoring system, which is why I tried linking them. One of the hang ups with the two tanks together was that I wanted to be able to refuel in flight with a spare Facet pump by carrying another tank in the jump seat. One of the things concerning me was that I would be filling one of the tanks up, but not the other and not knowing how long it would take for them to equalize.
I finally gave up and bought a dpdt switch on a trip to town yesterday. I then wired both the senders that I had in my tanks to the switch, replumbed my tanks to a fuel selector switch. Now when I get down to one gallon of fuel in the tank that I am using, I change tanks, flip a switch and I can see exactly how much fuel I have remaining in the tank that I am using. Now I can refuel in flight and know that I am not overflowing the tank that I am filling.
Larry, Oregon
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