I get spark ,but the fuel does not come through the nozzle. The fuel line and the nozzle are not blocked.I can blow through them.

*Are you sure it's block...? Make sure check fuse first.
-If so.
-Lose connector from engine and connector at tank then use
air nozzle blow from engine couple times then from tank. If any thing stuck in the line it should came out.

Mai

No fuel!! Several things can cause this, empty fuel tank, dirty fuel filter, plugged screen in the nozzle assembly,or plugged nozzle. So lets clean up the fuel system by first removing the top section of the heater and exposing the burner tray. Remove the tray and locate the fuel nozzle, remove the nozzle, now they say you can not clean them, I say with a q-tip, tooth pick and carb cleaner you can just be careful not to damage the nozzle. Behind the nozzle is a screen assembly these corrode at times so clean it up too. Below the nozzle assembly is the flame sensor, clean this with windex and a soft terry cloth rag, make sure it will have a clear unobstructed view of the flame.Put the nozzle assembly back together, and now inspect the fuel line for cracks, holes,and dry rot replace if necessary. Trace the lines down to the side where they come thru the case. Remove the side cover and locate the fuel line and in line filter, remove the filter. Cleaning this is easy you need a compressor and blow gun, all you do is blow air backwards thru the filter and instantly its clean. Inspect fuel lines and reassemble. Now make sure that you have clean fuel in your tank, and there is no water in it as well.Plug it in and you should now be heating like new. If not it could be your fuel pump!

Check the fuel lines and the nozzle. Make sure there are no leaks from the air/fuel lines at the nozzle fittings or air pump. The air pressure from the pump is no where near what you forced to the nozzle with an air compressor. You can push fuel past a plugged nozzle to get it to fire with your compressor, but the air pump can not even if it's new. Check the lines for leaks with soapy water. take off the nozzle and clean it to be sure it isn't plugged. Dont loose the spring inside to nozzle. Check the pressure at the pump testing port. You can buy a gage as descibed below at an ATV dealer. use a valve stem with 1/4 threaded end and a shrader valve at the other to adapt this for testing. Extra low pressure pencil-type gauge registers 1-20 psi in 1/2 lb. units. Do not use a standard tire gage, They are not accurate at low pressures.


Good Luck

I have several of these in my shop. When they act up it is usually carbon deposits blocking the fire eye. This is a sensor that detects flame, if no flame is present it shuts down the whole heater. Remove the upper cover of the heater and attempt to start it, watch for 1- spark from the ignition sorce 2-fuel being sprayed from the atomizing nozzle 3-ignition of fuel. No spark bad spark plug or ignitor, no smell of fuel or small cloud of fuel, bad fuel filter, no fuel, bad fuel line, bad or plugged nozzle. There are several things that cause this but these are the three most common problems I encounter.

please rate, thanks

Installation

1. Thoroughly clean nozzle bore in cylinder head before reinserting nozzle assembly with Nozzle Seat Cleaner T83T-9527-A. Pay particular attention to seating surface, in order that no small particles of metal or carbon will cause assembly to be cocked or permit blow-by of combustion gases. Blow out particles with compressed air.
   
   
   
   

1. Remove protective cap and install a new copper gasket on nozzle assembly with a small dab of Multi-Purpose Grease D0AZ-19584-AA (ESR-M1C159-A) or equivalent. NOTE: Anti-seize compound or equivalent should be used on nozzle threads to aid installation and future removal.
   CAUTION: Be careful that nozzle tip does not strike against recess wall.
   

1. Install nozzle assembly into cylinder head nozzle bore.

1. Tighten nozzle assembly to 47 Nm (35 ft-lb).

1. Remove protective caps from nozzle assemblies and fuel lines.

1. Install leak-off tees and lines as an assembly by lowering onto nozzles. Connect clip and hose to fuel return elbow at pump. Install line to retaining clamps. NOTE: Install two new O-ring seals for each fuel return tee.
   

1. Connect high pressure fuel line(s) and tighten to specification using Fuel Line Nut Wrench T83T-9396-A.

1. Start engine.

1. If necessary, purge high-pressure fuel lines of air by loosening connector one-half to one turn and cranking engine until bubble-free fuel flows from connection. WARNING: KEEP EYES AND HANDS AWAY FROM FUEL SPRAY. FUEL SPRAYING FROM PARTIALLY OPENED CONNECTION UNDER HIGH PRESSURE CAN PENETRATE THE SKIN AND CAUSE INFECTION. MEDICAL ATTENTION SHOULD BE PROVIDED IMMEDIATELY IN THE EVENT OF SKIN PENETRATION.
   

1. Check for fuel leakage at high-pressure connections.

Hi Please check your oil zzle is not blocked at all. Remove the burner head and renew the nozzle. If that fails you will need to check the fuel pressure from your fuel punmp which should be at least 9-10 bar.

the clicking indicates a spark plug ignition. see if the spark is created across the spark plug gap. if it is then check the alignment of the plug in the nozzle spray pattern. if there isn't any fuel flow then all the clicking ain't gonna make any difference in the world!

your nozzle is plugged.to clean the nozzle you take the cover off,slide the motor out of it's slots and push it to the rear of the unit,remove the air line and fuel line,remove the three 3 screws holding the nozzle assy. on.once you have the nozzle assy. out you will see a brass nozzle on the inside,put nozzle assy. in vise to hole it.take 5/8" socket and remove the nozzle from holder.take the nozzle holder out of vise and put brass nozzle in vise.do not put a lot of pressure on it or you'll bend it.by the way pointy end down so you can take the nozzle apart.once you have the nozzle in vise,take a pair of plyers and carefully remove the inside of nozzle,it doesn't take a lot of pressure to turn the inside.just loosen it don't take it apart yet....remove it from vise and turn it uside down so pointy end is now facing up.rotate it over the work bench so you don't drop the piece that's inside.very tiny piece..... that the nozzle,it rotates inside to make the spray pattern.look through it and see if you can see light throught it.take an air nozzle and carefully blow through it....both ways.look again and see if it's clear.once it is replace everything in reverse order.do not put much pressure on the inside piece of nozzle when you tighten back in with the plyers.hope this helps........let me know

Your problem is most likely the lack of pressure from the air pump. Your pressure is extremely low. Pressure on a 100k heater should run 5psi. At 3psi there is not enough fuel and not enough air to atomize whats there. Bump the pressure up. If it won't come up, then you have an air leak. Test w/ soapy water. Keep your fingers clear of the fan!

Sounds like the PCV valve might be clogged and has created a vacuum within the fuel line. A new valve will cost you about $15.00 US and is easily replaced. You will find it on the top of the valve cover, depending on the engine model you have.

You should also check the fuel pump and verify that it too does not have a vacuum and therefore is not drawing gas from the tank. The fuel pump is located inside of the trunk. When you turn the key to the on position, have someone listen inside of the trunk for the faint sound of a motor come on. If you hear the pump engage, then you might have a blockage within the fuel line.

To fix a physical block in the fuel line you will need an air compressor and a blower nozzle that will fit inside of the fuel line. To blow the fuel lines out, begin by removing the fuel line from the fuel pump at the tank, then remove the line from the backside of the fuel filter. Place the end of the fuel line that was detached from the fuel pump into a large bucket and somehow tape it in place so that it will not blow out of the bucket when you go to blow it out. Now take the compressor air nozzle and insert it into the fuel line that you detached from the fuel filter and GENTLY begin blowing air into the line and have someone watch the other end in the bucket.

Once you have air flowing freely through the fuel line, reattach everything and fill the tank with fuel (if it's still empty) and try starting the engine again. If you still have the stalling problem, more than likely the fuel pump is shot and will need to be replaced.

Hope this helps you out.

Cheers,

Keith