has anyone had any trouble with the 601 fuel system losing prime if it sits for a while ?

 I have had an issue with a 601 standard arrangement just like the plans call for . The line goes to the center counsel from the wings and then up to the fuel selector then down to the gasculator

i had the 601 sit for few weeks and then couldnt get it started , wich was strange becouse the 3300 usually fires right up , i tried to drain the gasculator and the fuel didnt come out at a steady rate, just kind of chugged out.

i finally got it started with  running the  electric fuel pump for a while and them checked the gasculator and fuel flowed fine after that

just wondering if anyone else has had this problem?

 i didnt like the uphill run from the center cousle to the selector that the plans called of and i think thats making it lose prime or flow .

let me know what you guys think

Tracy Buttles

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Comment by Ian McClelland on October 8, 2011 at 3:24pm
Hi Tracy. I have the same setup as you. I have not had this problem. I wonder if you have a slight leak in one of the lines? Might be worthwhile looking for fuel stains on all your b nuts and selector valve. The New Zealand AV Gas leaves a breen stain if there is a leak. Very obvious to spot a leak.  Zenith also issued an advisory a while ago about loose screws on the selector valve.
Comment by Stephen R. Smith on October 7, 2011 at 10:09pm

Hello Tracy,

My fuel selector is on the center console - standard installation with Jabiru.  I don't have a both position. I have never had any problems with fuel delivery. In fact, I often run a tank dry while flying.  I watch my Dynon fuel flow and pressure.  When they start to dance, I switch tanks.  This has always worked.

I have never needed the electric pump.

It seems odd to me that there was no fuel in the float chamber to start your engine after sitting only a few weeks.

It would seem there is always somthing new to learn.


Comment by Bob McDonald on October 5, 2011 at 7:08am
It may just be something to pre-flight check after a period of storage. I know that if I drain a wing tank dry on my high wing CH750 I need to use the electric boost pump to establish fuel flow after refilling the tank. Head pressure is not enough to establish fuel flow...once the siphon (fuel flow) is established its not a problem.
Comment by Tracy Buttles on October 4, 2011 at 7:11pm

I have to make the fuel sytem that i have  more clearlly explained.

 both lines go to a fuel selactor(airdyne) that just has left right and off ,,no both

gasculator then electic fuel pump, mechanical fuel pump(jabiru)  then carb


Comment by Bob McDonald on October 4, 2011 at 6:58pm
Each wing tank should have a seperate electric fuel pump to supply the engine. If you run one wing tank out of fuel while selected to "Both" there is a real possibility the fuel pump on the engine will suck air from the empty tank easier than fuel from the fuel tank with fuel in it. The individual electric fuel pumps (no check valve model) solve this issue and are a cheap fix if the engine pump fails.

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