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Snowmobile backfires in pulse fuel line

Seems to lean out fuel and backfires inside crankcase pulse hose on excell

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SOURCE: 1998 Arctic Cat ZR 600 Snowmobile dies out

air adjustment

Posted on Apr 18, 2010

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I have a 97 polaris xlt 600 triple that now hard to start and seems to flood very easily and sometimes backfires. I have spark on all 3 plugs.


Check the diaphragms in the fuel pump most likely flooding through the engine pulse tube from the crankcase.

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1 Answer

My 95 Tahoe has no power and it backfires on all down grades also is getting terrible gas mileage.got any ideas??


backfiring is due to explosive fuel mixture entering the exhaust system. It can be an extreme lean mixture igniting from a hot exhaust ( leaking manifold -vacuum hoses--EGR unit) or excessive fuel from dribbling injectors.---low fuel pressure producing lean mixture. Run the fault codes to see if there any reported faults.

Jul 30, 2014 | Cars & Trucks

1 Answer

Backfireing


Back firing is caused but lean conditions suggest a fuel injector volume test. This requires a injector pulse generator. pulse each injector for same interval usually 100ms and record pressure drop and re prime line between each test for accurate values. If all is fine. remove valve cover check for broken valve spring or flat camshaft lobe. low rocker arm movement.

Nov 09, 2013 | Jeep Cars & Trucks

1 Answer

My chainsaw carbarator is not getting gas. model# 358357230


Chainsaws have all position diaphram carbs, this is because it has to work in all positions, one side of the carb will have a pump diaphram, this is actuated by a positive and negative pulse from the piston riseing and falling ( there will either be an impulse pipe from the crankcase to the carb, or a hole in the induction block and gaskets to achieve this ) the other side of the carb will have a metering diaphram, a needle and jets, this takes the place of a float bowl on a normal carb, as the engine is cranked the pump diaphram pulses, this in turn draws fuel from the tank via the fuel hose and filter. So if there is no fuel in the line, either the filter in the tank is blocked, or the hose is trapped,split or leaking, or you have no impulse to the carb.

Jan 02, 2013 | Garden

1 Answer

440 cyclone 1976 snowmobile. Machine wont start. Has fuel, spark and compression.


Clean your carburetors and check the intake manifolds for cracks or separation. Also , take apart the fuel pump and clean it. If the fuel pump diaphragms are bad replace them. Inspect the fuel pump to crankcase pulse air tube for cracks or leaks and replace if bad. If machine bogs after you get it running consider replacing the crankshaft end seals. New crank seals might save you from a more expensive motor burn down.

Feb 01, 2011 | John Deere 420,1020,2010,2020,2510,2520...

1 Answer

I have code ;to lean; on ford expedition 1999 what's that mean


A lean condition can be caused by too low pressure to the fuel injectors causing a lean condition where there is not enough gas being supplied to the combustion chambers.

It can be caused by a faulty oxygen sensor or sensors which control fuel delivery.

It can also be caused by dirty clogged injectors that don't deliver enough fuel no matter how long the pulse width is from the computer for one or more injectors.

A lean condition can cause poor engine performance and backfiring.

Oct 09, 2010 | Ford Expedition EL Cars & Trucks

1 Answer

I need to know how the fule lines go in a 82 440 kawasaki snowmobile none of mine are hucked up right and does that model need a battary.


Your snowmobile does not need a battery to run. The fuel line form the tank goes to the IN "arrow" on the fuel pump. The OUT "arrow/arrows" go to the carburetors. The pulse line goes from the nipple on the back of the motor to the pulse nipple on the fuel pump.

Aug 30, 2010 | kawasaki KX 450 F Motorcycles

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On a 2-cylinder, 25 hp Briggs & Stratton INTEK twin engine (year 2002, Model 44577-0134-E1), there is a ~1.5-inch rubber hose to the top of the right OHV cover coming down from a round plastic piece in...


Ok I haven't worked on this exact model before but Im curious if the engine runs?
It sounds to me like a fuel pump that uses crankcase pulses to pump the fuel. It is very common way to pump fuel but usually the pump portion is in the carb and not the fuel line.
If it were attached to the intake Id say it was a crankcase breather.

May 01, 2010 | Briggs & Stratton Briggs Stratton Intek V...

2 Answers

McCulloch Chainsaw carb not getting fuel


This is the same problem I have with a Mac 3200. I have: (1) A line from the primer bulb to the front port on the carburator. (2) line from fuel tank, with attached fuel filter, to the other primer bulb port. (3) Line from port on back of carb. to ????. I thought it must be a pulse line, but not certain, and don't know where to run it to. Please let me know when you find out.

Aug 13, 2009 | Poulan Pro 42CC 2 Cycle Chainsaw, 18"

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