Wont stay running, fires up then shuts down, has fuel and spark, what else could be the problem. The filters are clean, also

Check your coil and spark plugs.

If the vehicle is equipped with a timing belt, make sure it hasn't jumped throwing the valve timing off.

First you must determine if the fuel is stopping or the spark is stopping..If the fuel is stopping this could be a computer problem.. If the spark is stopping then it could be the IGN Module in the distributer. or any nomber of sensors. Squirt a little fuel directly into the Throttle body on the intake manifold.. If the truck runs longer its probably loss of fuel.. Do this several times to make sure, be careful and only use a small amounty of fuel.. you do not want a fire.. RE: Spark: Take a plug wire and an old plug..put the wire on the plug.. hold the plug against a good ground .. have someone crank the engine .. does the plug stop firing? The engine dies.. and will not restart for a minuet or so.. during this "no start" time do the plug test. If the plug will not fire during this time take the module out and take it to Orillys Auto parts.. They can test it.. really expensive part. Don't replace until you know it is BAD..

Fuel filter could be so stopped its not letting but a small amount of fuel pass just enough at a time to start the engine but not enough to keep it running;Fuel Pumpcould be going out ;Check to see if the engine is getting fire by putting a spark plug in the number 1 spark plug wire and grounding it off while some tries cranking after it goes dead you have to elimanate weather you have fuel or firing problems could be Contol Moduale Problems; Check fuel pressure(Filter& Pump)if not that Check Firing Problems Control moduale make sure it has Diaelectic grease at contact elimanate problems & ask more Questions on FIXYA.com

This can be a result of several things. The most common problem is the photo sensor. If there is a flame, and the photo sensor can't detect it - the furnace will shut down. If the furnace has run dirty and sooty - there's probably black soot covering the sensor, blocking the light of the flame. Remove, wipe the lens, and reassemble. Try for ignition again. Keep in mind, after three unsuccessful starts, the primary control will shut down in lock out mode. This is to prevent an additional start as the chamber is probably soaked with heating oil. It should be cleaned completely before attempting ignition again.

The filter may be sufficiently blocked to prevent fuel to flow at a rate the burner needs. Replacing it may be required. If not a dirty filter, lines may be clogged by bacteria in the oil that has clogged them. You might need to have the lines blown back to the tank with a compressed air tool designed specifically for this purpose. Air in the fuel line can cause the flame to go out, and once out it will not restart without the spark. This can be caused by the constant vibration of the burner. A loose coupling between the blower and oil pump can cause the flame to go out, as could a faulty oil pump. Too little combustion air can cause soot - too much is almost as bad.

The real problem is lack of professional maintenance. An oil burner needs to be tuned, not just cleaned. Proper air / fuel mixtures, nozzles replaced when worn, heat damaged parts replaced, clean heat exchangers, stack temperatures, draft, etc. must all be "tweaked." for optimum performance. A properly tuned traditional burner can be 86% efficient - newer styles well over 90%. But they won't stay that way without annual tuning. With the cost of heating oil, why settle for less than optimum efficiency?

Good luck!

okay if you have spark sounds like fuel delivery... if pump is new then check the fuel filter..... if filter is good check to see if there is a secondary fuel pump bolted to the driver side frame rail.... if everything checks out fine find the inertia switch and reset it it is possible it can trip.... it is a fuel shut off switch designed to trip and shut off fuel in case of an accident but malfunctions do sometimes occure with them... hope this helps

1. Clean the air filter.
2. Drain the tank and refill with fresh fuel mix.
3. Replace fuel filter and Inspect fuel lines for cracks.

If 1 – 3 don’t fix the problem, spend $40 for a tune & repair up at your friendly neighbor hood chainsaw shop. HTH
Lou

read my solutions on this site for clogged carbs.....Tim

Dear travelinman4, 02-21-2009 18:24 EST (USA)

Re: Reddy Heater "Won't Stay Running"
Model R150A

Old Fuel? Added a Can of Fuel Booster? Used Starter Fluid?
Spark Plug or Igniter?
Gas, Propane, or Kerosene?

jack

Most use a spark plug to ignite fuel it could need cleaning. You also could have water in fuel or dirt
check and clean ignitor/spark plug clean fuel line and nozzle, drain and clean tank Check for water in fuel by tilting unit to have a low corner siphon fuel from that corner after 1 hr inspect for water.