Help! Freshly rebuilt SU's leaking!

[Reverend]

I just recently glass beaded my SU's plus sent all the hardware for zinc plating. I dont know can you call that a rebuild but anyhow. I tried to start the engine and first i did not notice anything until it made couple loud POP's. Then i went to see and saw it was squirting fuel everywhere. Mainly from that big bolt on float bowl.

Does it have some sort of gasket or o-ring? cause i dont have any.. It leaks like crazy and i cannot start the engine.

Also, what would be the best settings to start the car, as i have dismantled and rebuilt carbs. Jet up or down or something between? I have FSM and unisyn but first i need to get it running and warmed up...

I really appreciate if you would help me fast, i need to get this baby running, wednesday is a big car show... :/

I removed the bolt and checked if there was anything blocking the fuel, there was not. Also decent amount of gas in float bowl.

[240260280z]

yes there is a gasket on each side and a filter inside

[Duffman]

Sounds like the float is stuck or the fuel valve is stuck open.

[Reverend]

I have filters on both carbs, but no gaskets. Rubber, paper or metal gasket? Im not sure about the valve, as float bowl was less than half full when i opened it. It would been squirting gas from float breather hose then, wich it did not.

[240260280z]

Metal on one side, I believe paper on the other.

Start with the jets at 2.5 complete turns down from their top most position.

[Duffman]

I have seen mainly metal crush washers on both sides of bolt but other fuel resistant washers as well, most leaks are due to bolt not being tight enough with washers.

[Stanley]

Mine have thin aluminum washers on both sides. Seems like rubber or something would be better.

[Reverend]

I managed to find proper washers and it stopped the leak. Now its spewing out fuel from front of the carb so float settings must be crazy

[Darrel]

n/m n/m

Edited April 28, 2013 by Darrel

[Travel'n Man]

When I was running SU's I always kept (and still have some) a few extra float bowl gaskets - once used, those things curl up like a pringle potato chip - anyway, did you replace or reuse that gasket?

[Bruce Palmer]

Take the float bowl lid off and remove the needle and seat from the underneath side of the lid. Take it apart and flush with carb cleaner. You may have foreign material stuck in there holding it/them open. You may also want to check fuel pressure. More than about 3 1/2# of pressure can overpower the N&S holding them open.

Another thing to check while the lids are off is to A. make sure the floats are moving up and down freely and B. while blowing lightly into the fuel inlet tube, while moving the float toward the lid, you can feel them (the N&S) shut off.

[Reverend]

Floats/needles seem to work okay, i begin to question my timing advance. As it POPS and spews out smoke occasionally, but no bueno on start. I have DIY electronic dizzy (made by one local dizzy wizard) and it has this little red lamp that lits when engine is at TDC. Grooves on pulley match the lamp.

EDIT: Now it does not even tr to start anymore. 12.2 volts on battery and it does not start... :mad: I wonder did i broke starter solenoid I did not "overstarted" as far as i know, only like 5 second periods, then pause, then again. Also the weirdest thing happened, i attached charger cables to battery and it almost fried the wires..!! What the heck is going on here..