Prime fuel line on carbed 787 rebuild

[CASPX]

what is the best way to prime the fuel lines on a carbed 787?

Fuel lines are empty.



Thanks

 

[98GCLimited]

Easiest for me is to just pull the return line off the rear carb and blow into it until fuel flows out of the return nipple you just took the fuel line off of. Can use an empty plastic bottle to catch the fuel as it comes out so you dont make a mess. Make sure the fuel selector is in on position and not off.

 

[Matt Braley]

what is the best way to prime the fuel lines on a carbed 787?

Fuel lines are empty.

You pull the choke and crank the darn thing up. Don't hold the starter engaged for over 8-10 seconds before you stop to let it cool. If it does not crank up in the first burst or soon into the second then your fuel pump sucks or you have an air leak.

Thanks

You pull the choke and crank the darn thing up. Don't hold the starter engaged for over 8-10 seconds before you stop to let it cool. If it does not crank up in the first burst or soon into the second then your fuel pump sucks or you have an air leak.

 

[CASPX]

You pull the choke and crank the darn thing up.

Tried this several times but it does not work. I drained the tank and lines so it's totally fresh.

I have inline filter which I can watch the level in so I can see what it's doing and it'll slowly fill the filter by gravity then I'll try to start it, it'll drain the line after the filter then there is a air gap and no more gas going in to the filter.

Easiest for me is to just pull the return line off the rear carb and blow into it until fuel flows out of the return nipple

Did this too and it pressurized the feed line clearing out the filter and making back pressure on the return line sending it back to me???


Where is the smash your ski with a hammer emoji could use one right about now

 

[snikwad003]

I use one of these on the return line and vaccum it through

 

[CASPX]

Easiest for me is to just pull the return line off the rear carb and blow into it until fuel flows out of the return nipple you just took the fuel line off of. Can use an empty plastic bottle to catch the fuel as it comes out so you dont make a mess. Make sure the fuel selector is in on position and not off.

Return line trick worked with a modification.

Got to thinking about why it'd pressurize and fuel pump manifolds where stopping gas from flowing in to the carbs so the system would pressurize and not pass the air lock in the pick up line.

Fix was to put a long line on the out bound side of the filter (removing the carbs from the system) and in to a gas can. Then pull the return line and blow in to it, hold the pressure with your thumb until I had good flow through the filter and siphon in to the gas can. Tho stop it without loosing the siphon I raised the return line hose and slowly let the back pressure out. Then hooked the return line back up. The raised the out bound flow line from the filter until the flow stopped, drained out as much as I could out of the siphon line then pulled the siphon line capped fuel filter with left thumb & capped siphon line with right thumb. raised siphon line until the remained drained in to the can and dropped the line. Now with right hand quickly placed fuel line to carbs back on and wa-la gas lines primed...finally.

 

[FaceDeAce]

You pull the choke and crank the darn thing up. Don't hold the starter engaged for over 8-10 seconds before you stop to let it cool. If it does not crank up in the first burst or soon into the second then your fuel pump sucks or you have an air leak.

Agreed! No priming required. Fill the tank to half full. Turn on the fuel valve. Crankit.

I just recently finished re-tubing both of my machines completely. I did not prime anything. Pull choke, crank, wukawukawukawuka vroom vrooom vroom.

 

[Mickirig1]

Big thing is pull the choke full out. About 10 winds of starter she fires!