Story follows, not verbatum but close enough to convey the hilarity. This is a true story !!!!!
Customer: I cannot get my engine to run. What's wrong?
Hobby shop: Well, what is it doing. ?
C: I think the starter isn't turning the engine fast enough.
HS:If you are running it on a 12v battery, it is going fast enough.
C: Yeah, it's a 12v battery. The engine just spits fuel at me.
HS: Is the needle valve set about 2 1/2 turns out?
C: It's way out.
HS: What engine is it?
C: OS 40 LA.
HS: Do you have the tank feed line connected to the engine and the pressure line to the muffler fitting?
C: I have it hooked up like that, but there is nothing on the needle thingy.
HS: There is no tubing connected to the needle valve???
C: No, the tank goes straight to the front of the engine.
At this poing, HS gets out an OS 40 LA engine and points out the carb and the needle valve.
C: There is no tube from here to there, the tank is hooked to here ( points to the carb nipple ).
HS: ( rolls eyes and sighs ) You MUST connect the tank here (points to needle valve inlet, and connect an extra piece of tubing from here to there ( nv outlet to carb inlet ). Then the engine will probably run.
C: OK, I'll hook up the tubing and see what happens.
AREN'T NUGGETS FUN???????????????
David Long conversation with customer at hobby shop about trying to get an OS 40 LA started, condenses to find that the customer had the tank connected DIRECTLY to the carb nipple, NOT the needle valve !