Priming fuel after carb rebuild

[trotty]

Hi I have installed b pipe new fuel tank, rebuilt carb and put it altogether. I have gone to turn it over and it wouldn't start. I have primed it 5-8 times and takn plugs out to see if fuel comes out of the plug holes to which it doesn't. It pushes air out of the engine to carb line. I was wondering if this is a case of me not putting enough fuel in their or would it be a problem with the rebuild I guess I'm asking where to look first. Thanks

 

[Quinc]

Check again that your fuel lines are hooked up correctly. Turn the engine over and you should see fuel getting pumped through the lines. If you do not see fuel coming through the lines. Pull your pulse line off and put your thumb over it to check that there is suction while turning over the engine.

 

[Vumad]

Make sure the fuel is above the pickups if you didnt put a lot of fuel in the tank.
make sure you did not accidently hook up your fuel lines incorrectly.
if you do not have a primer pump, install one
You can manually choke the carbs by rekoving the air filters and puttkng your hand over the intake

 

[trotty]

I've taken carbs off, their was no suction at the pulse line. When I blow through where the engine line is this goes to the slave carb. When I blow through the pulse line I can hear the diaphragm open but cannot blow any further, is this normal, when I suck it it returns to the close position.

 

[Quinc]

Is your fuel switch on?

On the carb verify that the:
-Fuel "IN" is the bottom connecter
-Return line is the top connecter

 

[trotty]

I didn't put a lot of fuel in maybe a litre at most. But it should be enough to run fuel through the carb and its dry other than where I primed it in the throat.

 

[Quinc]

fill the tank at least 25%

 

[Big Kahuna]

You have no suction at the pulse line when you turn the motor over? Means you have not case pressure below the pistons.........

 

[Vumad]

I didn't put a lot of fuel in maybe a litre at most. But it should be enough to run fuel through the carb and its dry other than where I primed it in the throat.

Is this a stock 5 gallon fuel tank you put a liter in? Even if you have a 2 gallon tank that's only about 1/8 of a tank. That's probably pushing your luck with klunks on the bottom of the tank.

I think if you cut corners on putting gas in the tank, you might want to reevaluate the quality in which you are willing to do a job. Go back through all your work and check back with us.

You should probably consider bringing it to a professional.

 

[superjetincairns]

Make sure you don't have the pulse line and fuel input line switched around. They're pretty close together. and I doubt a litre of fuel would be enough to reach the pickup. You would definately need to have your switch on reserve to pickup that amount of fuel.

 

[trotty]

sorry big kahuna I meant where it goes to carb, it does push air out of the crank line.quinc ok il put more fuel in and I did place it on reserve. Vumad sorry if I come across as not being as clued up as you boys but this is why I'm asking questions, to learn and progress. I appreciate the feedback and when I get it going I will appreciate it much more than just paying someone to do it. I guess I was just scared I had rebuilt wrong, so in the event of taking carbs off I didnt have much fuel to deal with plus it is a new fuel tank so there is no sludge. Il put more fuel in and get back to you. I'm very conscious of the work I do on the ski and I look to people here to help me so please don't raise eyebrows I'm only asking for advice. Thanks

 

[Vumad]

sorry big kahuna I meant where it goes to carb, it does push air out of the crank line.quinc ok il put more fuel in and I did place it on reserve. Vumad sorry if I come across as not being as clued up as you boys but this is why I'm asking questions, to learn and progress. I appreciate the feedback and when I get it going I will appreciate it much more than just paying someone to do it. I guess I was just scared I had rebuilt wrong, so in the event of taking carbs off I didnt have much fuel to deal with plus it is a new fuel tank so there is no sludge. Il put more fuel in and get back to you. I'm very conscious of the work I do on the ski and I look to people here to help me so please don't raise eyebrows I'm only asking for advice. Thanks

You can drain the tank easy by having the tank hooked up with the pickups in the fuel. Put the lines connected to pickups in your fuel can and slightly pressurize your fuel tank through the reserve line. The pressure will push the fuel out the pickups and drain the tank in a minute or so.

Be careful not to spill any fuel. If you make a mistake, put your finger over the fuel line and unscrew the gas cap to quickly relieve the pressure.

 

[Quinc]

your fuel switch could be bad too. You can hook the res fuel line up directly to your carbs

 

[trotty]

Put more fuel in and it hasn't resolved it, fuel isn't pulled through I think it may have something to do with my rebuild. I can suck the fuel through and it comes through fuel filter but is not being pumped through carb. Line coming from crank creates pressure when turning over but when connected to carb sounds as though it can't push any through as the Pistons struggle to turn over. Will open carbs to verify I correctly rebuilt it. The only thing I never replaced were the check valves as they were spotless.

 

[trotty]

I didn't put the thick paper gasket on pump cover so I guess the clear diaphragm wasn't working correctly, when I opened it the clear diaphragm was creased so I've replaced with another. Ive checked everything else and seems ok. Buttoned it up and blew/sucked through pulse line and can hear diaphragm opening/closing. Quite a lot of fuel went into crank when I was priming it, but nothing coming out of plug holes when turning over I'm not going to fuel lock this am I? To get fuel all through the lines would it be a good idea to blow through the return line to push the air out and re pressurise the fuel system before turning her over?

 

[trotty]

Put carb back on assembled all lines and she fired right up, was ready to prime the s/(t out it if an air leak occurred lol. Was pretty loud I'm guessing as there is no water in water box. Right I guess I'm ready now to take to the lake and fine tune cheers guys.

 

[CRJ]

Hi I have installed b pipe new fuel tank, rebuilt carb and put it altogether. I have gone to turn it over and it wouldn't start. I have primed it 5-8 times and takn plugs out to see if fuel comes out of the plug holes to which it doesn't. It pushes air out of the engine to carb line. I was wondering if this is a case of me not putting enough fuel in their or would it be a problem with the rebuild I guess I'm asking where to look first. Thanks

i pull off the return and crank it till it start dripping, and use that to prime the intake, then connect it back to the tank. you can suck on it too to pull it through.

 

[trotty]

right not going to start it anymore until I take it to lake. The carb is setup as follows 135 mains 75 pilot stock n/s stock f/a with 1 screen removed, 115g spring. 1 turn on lows and 1.5 on highs. At the moment it doesn't idle correctly in that It would stall but accelerates ok upon picking Rpms up, I know you can adjust the idle on the stop screw but until I get it under load don't want to fiddle too much.

 

[CRJ]

your low adjusts idle. take it out 1.5 turns. turn it in SLOWLY till the engine stumbles and wants to stall, then turn it out 1/4 turn. Its now set, LEAVE IT ALONE! if you move the idle set screw you have to redo this step. the rest of your tuning is in the high adjustment, N/S and M/P jets.

 

[trotty]

your low adjusts idle. take it out 1.5 turns. turn it in SLOWLY till the engine stumbles and wants to stall, then turn it out 1/4 turn. Its now set, LEAVE IT ALONE! if you move the idle set screw you have to redo this step. the rest of your tuning is in the high adjustment, N/S and M/P jets.

So I put both lows at 1.5 turns out and gradually turn in until it wants to stall then out 1/4 turn, do you do one carb at a time or both at the same time. I haven't touched the idle stop screw so will be doing the way you said when on lake.