2 Answers

follow the hole (where the fluid comes out with a thin long wire about 22 gauge ( you can get that from a gardening shop. it would be the same thickness as the metal in a twist tie( for bread) 

then feed it through and you should see it . Or try  getting a syringe, fill it with water and shoot the water into the hole it should come out where the hose should be.. connected .  Using the wire trick will clean out any debris if theres a clog in it too. Be careful not to break off the wire in it though.This small of a gauged wire is not too ridged . know that with wire the higher the number the thinner the wire. example a needle to draw blood is a 16 gauge needle( a big one ) a 27 gauge needle is longer and a thinner (looks scarier cause its longer but made to go deep into the muscle without tearing a path through the muscle and inject a fluid much thinner than blood) 

thats how i remember wich gauge is bigger