Just a thought, but are we all doing our backup fuel pumps incorrectly???? Someone mentioned to me the other day, what if, the main pump fails in such a way as to totally block the system. Would the
Craigh, The Rotax and factories fuel circuit diagrams call for he pumps to be in series, with non-return valves parellel to the pumps. In that diagram a blocked fuel pump will be bypassed by a valve.
Hi Ron, How do you calculate that? Valve one open? Pump 2 will supply. Valve one closed? Pump one will supply. Valve 2 open? Pump one supply, Valve 2 blocked, pump 2 will supply. The same logic count
Hi Jos "How do you calculate that?" (failure because of failed Andair 1 way valve) I will first mention that my 1988 R100GS BMW motorcycle with type 64 Bing Carbs has a vacuum controlled valve that t
Hi Ron, Thanks for the amount of explanation, you are correct: If And If brings you down. No fuel left also. However, i specifically mentioned "any single component failure" because there always seem
Hi Jos "any single component failure" **Air leaking at valve #1 could be same as air into a Gasculator or filter and shut you down **Having Series with bypass, a single air leak at either of the Gasc
"On my system if I pushed up on one of the beautiful Stainless Steel Andair bowl drains, just the tiniest bit, either pump #1, or #2 or both #1+#2 would far rather suck air than fuel" Ron, I have to
Hi Remi "If your fuel pumps are installed below the baggage bay as instructed by Europa, they will always be below the fuel level, unless your tank is almost empty." My Fuel 914 pumps are mounted bel
I guess i asked a good question here, Based on the too-ing and frow-ing here i plan to stick with my original plan to parallel the system as far as the engine, that way both pumps and gascolators can
Hello Ron, You said :- At the risk of sounding pedantic, what is the significance of your reference to the "right hand pattern" ? I suspect you are saying that because you are turning to the right, t
Craig, For checking the fuel system i added fuel flow sensors in both feed and return line, and the matronix controller to see fuel flow on the Dynon (or any other fuel flow meter). Extra is a switch
I missed some of the correspondence on this subject, so I hope the following is not repetitious:- On the 914 engine, Rotax originally specified that the two electric pumps should be in parallel. This
Roger Bull a crit : Roger, Did you get this information through a reliable Rotax channel ? I was under the impression that Rotax had followed one of the Pierburg drawing, but failed to include check
K YOu are right on to it! JR -- Original Message -- From: "Kingsley Hurst" <hurstkr@redzone.com.au> Sent: Tuesday, December 11, 2007 11:40 PM Subject: Re: Europa-List: Secondary Fuel Pump, correct or
Hi Kingsley "At the risk of sounding pedantic, what is the significance of your reference to the "right hand pattern" ?" I was trying to make a point that all can be well till a certain scenario is m
Hi Jos "For checking the fuel system i added fuel flow sensors in both feed and return line, and the matronix controller to see fuel flow on the Dynon (or any other fuel flow meter). Extra is a switc
Hi Gilles "Concerning the the flow with two pumps in parallel and regulator, the measurements we took did not show the problem you are referring to. (differential pressure going above 5 PSI)" Are the
Ron, Obvious mistake: I should have said liters per hour, not minutes. The fuel flow test does not test the flow to the engine, it tests the total flow out of the tank. While it is a good indication
Hi Jos "over 120 liters, and over 135 liters with 2 pumps on." This is probably very close to what I tested. I have a UMA differential gauge, and a UMA fuel flow gauge. I asked Ed if he could give me
Hi Ron, "To make total flow number mean more" Sorry, no, i don't think i could learn any more from that experiment. If the restricted fuel flow as in your proposed experiment drops below the fuel int