– … Why? Inspect the carburetor bulb for cracks on its face. Just remember: your boat may have these components in a different order. Then there is the other style that is a little more complex but works on the same principle as the Purge Primer. I installed a new primer bulb and also put new gas lines on. Check the Primer Bulb for Holes. Going backwards like that would require source of gas to be from "vent" line in tank which isn't low enough into tank and would not be filtered. Formation of air bubbles (foaming) and resulting small, round concave depressions (cratering) when bubbles break in a paint film during drying. The most common source for an air leak is the water separator. Remove the filter and repeat the test. If not try it that way. POSSIBLE CAUSE. I would suggest that you start at the fuel tank and work your way to the carburetor. Your question was published, help is on its way! I sanded off the factory primer and used Shop-Line JP375 as the new primer. The air bubbles can be coming from a leaking high speed check valve and dipping a carburetor can destroy these check valves. Ok I have a stihl 041 farm boss that I have been working on. If you do not, the check valve in the primer is bad. The air has to be being drawn into the line if you're seeing it, presumably from the top unless things are completely clogged there and it's drawing backward... Clogged carb would mean you weren't drawing gas, not that you'd be drawing air into that line... Do the bubbles move in the gas line at all? No gas appears in the bulb when I prime it and, obviously, it wont start. Little bubbles in the fuel line from the carburetor to the primer should not prevent the engine from starting, but if the check valve will not seal when the engine is running, that could cause an issue. If not try it that way. Have taken it apart. I DRAINED THE FUEL TANK AND PULLED THE PICKUP OUT.LITTLE DID I KNOW THE OLD ORIGINAL CLUNKER HAD BROKEN FREE FROM THE BOTTOM AND COVERED WITH STICKY VARNISHED FUEL.NOTICING THE CURRENT PICKUP WAS SMALLER I THOUGHT I'LL PUT THE CORRECT PICKUP IN AND PROBLEM FIXED(AIR BUBBLES IN FUEL TANK) I CUT SOME WOOD,SAW STOPPED,TOOK OFF THE CAP, FUEL WAS BUBBLING,PULLED THE PICKUP OUT,FUEL STILL BUBBLING,FUEL WARM BUT NOT HOT.DO THE SXL 925'S HAVE FUEL RETURN LINES, CRANKCASE CHECK VALVES? I don't think the primer bulb itself is what's causing it to die, but may be a … After it cool for 20 minutes it starts again. Please Login or Register. Both the manual choke system and the manual primer system engines may experience this similar symptom of running only when the fuel mixture is enriched. Then there is the other style that is a little more complex but works on the same principle as the Purge Primer. We are more concerned of a car paint bubble as it pertains to a refinish process. It is essentially not seating and drawing air in through the discharge port. Water separators get dirty and can create a … Some engines utilize a manual fuel primer bulb to enrich the ratio of fuel in the fuel air mixture for initial engine starting. Some of the new trimmers have colored limiter caps on the low and high speed jets. one thing to check would be your primer ball. Small perforations on the rubber could inject enough air into the fuel system to make the suction too weak. Review these links while waiting for an expert response. All my engines have used an arched fuel line approach to the carb without problem. With the arrow pointing to the side where you pulled the hose off. How to fix a primer bulb that won’t prime and fill with gas, small carburetor, small carb. If I squeeze the bulb a few times it will clear the air out and will be full of fuel all through the line, then it starts all over again filling with air. 5. Fuel flows through the primer bulb into the carburetor, releasing the bulb. Re: Primer ball won't get hard. A clogged filter could cause bubbles … But a bubble rusting from the exposed area or from underneath is fairly evident and self explanatory. Pulled out primer bulb and verified action separately. If so its possible that the check valve in the primer bulb is bad, and the return from the primer bulb is creating the bubbles. Tiny bubbles that are uniform across the panel: these types of bubbles most likely are caused by moisture in the paint process. I told this to a shop and they thought that maybe they were reversed. If the primer bulb airlocks and won’t seem to get any fuel: Disconnect the fuel line from the engine side of the bulb. If … You could be sucking air - check the o-rings in the connectors. Check that the filter's in place and in good condition. Definitely pulls from carb side and pushes into tank side which makes no sense to me at all. I have a stihl fs45 trimmer. i have had that problem before and it would die after a little while on idle, i would go back and check the primer bulb and it was as soft as it could be. I found the primer bulb was the problem the check valve inside must have been broken. Step 1. Just a heads up. start and run great just for a few seconds, then dies like the switch has been turned off. It has a new fuel lines from the tank to carb and inside the tank. Hold the primer bulb vertically with the arrow facing the sky and squeeze the primer bulb until … Faulty Primer Bulb Another cause of the primer's filling problem could be the bulb itself. Gasping for Air Priming begins with air pressure caused by pushing air out of the primer bulb into the fuel tank. The air has to be being drawn into the line if you're seeing it, presumably from the top unless things are completely clogged there and it's drawing backward... 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