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In article <92qhgt$99i$1@nnrp1.deja.com>, LS >In article <1F%36.506$WF6.10134@vixen.cso.uiuc.edu>, > grunloh@uiuc.edu (Daniel Grunloh) wrote: > >Yep, thats how it is on my fun racer. The pump is mounted on one of >the engine support downtubes below the motor. You have to bring the >float bowl up to the correct level with the primer bulb before you >start it. It seems to work fine. I removed the primer bulb entirely from mine and now operate only with a separate fuel primer. Even without the primer, about 3 pulls on the rope will suck the fuel up the 30 inch rise needed. The fuel shutoff on this low mounted tank is unneeded and a possible safety problem. You cant see it from the cockpit and it could be accidently shutoff by spectators or luggage straps or whatever. I lock mine open with a tie wrap. A fuel shutoff is provided, but no sump or drain. >But I can see why youd want the pump somewhere else, like under the >tank, although the mounting on my racer hasnt kept me up at night (at >least not yet ;)). Unfortunately they do hard mount it on the frame, not the best, but they have a very good engine mount which absorbs vibration well. >I liked the setup on my old plane, where the tank was above the carb. >just open the valve and the float bowl filled by itself. And thered >probably be enough gravity feed to keep the float bowl sorta full in >the event of pump failure..... but thats just a guess..... > >LS >AC fun racer. > >> In article <3A4D0D83.1B1287D3@apex.net>, >> Bobby Hester >> >Ken Kennedy wrote: >> > >> >> Dave Loveman wrote: >> >> >> >> > In all cases the pump should be mounted so that it is ABOVE the >impulse >> >> > hole, no more than 12 inches from the vacumn source. Away from >heat, >> >> >My fuel pump is below my engine, mounted on a small plate on the >engine mount >> >and it has worked fine there. All Rans S12s have there fuel pump >mounted >> >below the engine. >> >> It does sound like a good idea to keep the pump above the >> impulse. A lot of installations do succeed even with the >> pump mounted lower. Most trikes from overseas, even those >> certificated, have the pump mounted below the impulse. I >> think it juts a good idea from Dave. >> >> Mounting the pump below the tank is obviously impossible on >> many trikes, powered parachutes, and fixed wings. >> >> The main advantage there would be that the pump would always >> have fuel and begin to deliver it to the carb bowl as soon >> as you begin cranking. -------------- Daniel Grunloh (grunloh@uiuc.edu) http://www.staff.uiuc.edu/~grunloh |
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