I need to know if there is a filter on the end of the pickup fuel hose in the fuel tank.i have a reddy heater ,model r100a.

Yes there is a filter. Pull up on the fuel line, or the rubber grommet that goes into the tank with the fuel line through it. There were different types of filter used. One is inside a black plastic tube. You can pick it out of the tube with a pick. Another style is located on top of the tank and is of white plastic. Your fuel delivery problem may be air related. The air pump is on the back of the blower motor, and meters a set volume of air to **** the fuel out of the tank and blow it through the nozzle. This air pressure is stated on the data plate on your heater, probably about 3.6 psi. The air filters on the air pump could also be dirty causing the air output to be reduced, and thus low fuel flow. Also check for air leaks at the pump. Spray soapy water on the black plastic cover and look for bubbles, which are of coarse air leaks.