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Where does the impulse line go to from the engine block.?

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There are two "impulse line(s)" on a typical "2 stroke chain saw.

One goes from the intake or crank case to the carburetor to drive the diaphragm "pump". Sometimes this "line" is built into the intake or transfer port and back to the carb by passage ways drilled into each and mating thru the gasket. The pressure pulses drive the "pumper carb" to deliver the gas, whether the upside down, sideways or vertical.

The other impulse line will go from the intake or crank case (between the carb and crank case) to the chain oil reservoir to lube the chain.

The pressure pulses (pos or neg) will drive the very simple oil pump to lube the chain thru passageways and/or tubes between the "bar oil" tank and the engine case where the chain bar is clamped to the engine. There are crossing slots in the case and bar that allow oil to flow and the bar to be adjusted in/out to tighten the chain. An internal passageway in the bar from the crossing slot to the chain groove gets the oil to the chain. Always be sure to clean these passages with a copper wire periodically as they tend to get clogged with very fine wood shavings.

Posted on Jun 01, 2014

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Posted on Jan 02, 2017

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Will only run on full choke


This is a fuel supply issue. Don't use the saw until you find the problem.
Things to check are:
fuel filter, fuel line crack, impulse line, carb needs work, air leak to engine. Etc.

May 20, 2017 | Stihl Garden

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Where is it located AUDI rpm sensor


For Diesel and also for Otto engines on 2004 Audi A4, this rpm sensor (impulse sender - crankshaft) is placed on the bottom left back side of the cylinder block.
148454a.jpg

on Dec 19, 2009 | Audi A4 Cars & Trucks

1 Answer

358356070 it has 3 carburetor lines I don't know where the one in the block goes to?


If you are referring to the impulse line that comes from the Cylinder it goes to the inlet on top of the carburetor which can be seen right after screw (part 147) in this breakdown http www searspartsdirect com model part 358356070 0247 1503220 00041614...

Hope this helps.

Feb 19, 2016 | Craftsman Garden

1 Answer

Homelite chain saw csp 3314 will start if i tip petrol in spark plug home but wont stay running


There could be a problem with either the fuel line going to the carb or the impulse line that's connected from the cylinder base that generates the 'pulsing' action that operates the diaphragm fuel pump. Today's alcohol rich gasoline has a tendency to weaken or even rot the rubber lines causing fuel delivery issues.

If you don't use your saw for extended periods, dump the tank empty then start the engine and run the residual gasoline from the line. This will help extend the life of the fuel lines.

Another possibility could be a blocked fuel filter, but that is remote.

Feb 22, 2015 | Homelite 12" Oregon Chain Saw Repl. Chain...

2 Answers

How to check fuel pressure 91 geo storm gsi


1.6L DOHC (same way as the ISUZU impulse ) same car.
4XE1 engine twin cam.
has MPI injection with fuel rail, regulator and loop
disconnecting the feed line and stuffing it with guage only does 1 of 5 tests. done on MPI. it does JUST the shut test.
the correct way it to check it at the filter or rail tests ports on most cars.
in some cases you must add it.
they sell banjo fittings with test ports at summit racing dot com.
so the first question on all MPI cars, is , where is the stock fittings.
other cars the rail has a schrader valve or a plugged hole to add one. (test port) did you look first for this?
to test the FPR, unplug the vacuum line running
and pressure will jump up 6 to 10 psi.
this simulates wide open throttle pressure, a key fact in getting full power from engine, i test cranking presssure, idle, 3000rpm
and wot pressures to be sure the PFR is working, not just the pump.



the spec at the rail is.

Late 1986 to 1993 I-TEC MPFI system (after VIN 0908197)
Regulator vacuum line connected-36 psi
Regulator vacuum line disconnected-42.5 to 45 psi

the shunt test can hit 60 pis easy. do so for only 5sec.
as this stresses the pump .

the only rail drawing , shows no fittings (cheap buggers)



not even a cheap plug...

24024302-wtht4tipiqsxmsfaksxjx4vs-4-0.jpg below is the twin cam, 1.6L
buy a TEE feeting, and put it at upper, red arrow.
use clamps rated for fuel injection, not chezzy screw band clamps as seen on carb cars. use the correct parts.
or you will get leak and it will not be pretty,
the filter as at 14 ID. this is the pressure feed side of the loop.
30 to 60psi , so all parts must be rated over 60, psi, (100psi is a nice goal)

24024302-wtht4tipiqsxmsfaksxjx4vs-4-1.jpg

now the words directly from the IMPULSE FSM.

Testing
  1. Relieve the fuel pressure.
  2. Disconnect the fuel line near the engine and install fuel pressure gauge T-connector in the line.
  3. Connect the fuel pressure gauge to the T-connector.
  4. Start the engine and check the fuel pressure, it should be:
  5. 4XC1-Turbo and DOHC I-Mark, G200Z Impulse: 35.6 psi with the vacuum hose of the pressure regulator disconnected and plugged. 28.4 psi with the vacuum hose connected and at idle.
  6. 4ZC1-Turbo, 4ZD1 Impulse and 4ZE1 engine: 42.6 psi with the vacuum hose at the pressure regulator disconnected and plugged. 35.6 psi with the vacuum hose connected at idle. Disconnect the VSV before checking pressure.
  7. V6 engine: 9.13 psi at the fuel pressure line after the fuel filter.
  8. 4XE1 SOHC and DOHC engine: Flow test, disconnect the hose from the EFI fuel feed line at the engine and place in a suitable container. Apply battery voltage to the fuel pump. Pump should supply 1/4 quart (0.24L) within 15 seconds. Pressure test, connect a pressure gauge in the fuel pressure line after the fuel filter, located at the driver's side frame rail. Disconnect the vacuum hose from the pressure regulator. Apply battery voltage to the pump. After the pump stabilizes, the pressure should be 35-38 psi (245-256 kPa) and hold steady.

Apr 06, 2014 | Geo Storm Cars & Trucks

2 Answers

What is an impulse sealer?


An impulse sealer heat-seals objects by sending high current on impulse to a heater ribbon, equipped on the surface of the heat-sealing blade, to generate heat that enables thermal-sealing through thermal conductivity. The section to be sealed is placed between the heat-sealing blades, pressed and thermal-fused when current and heat are delivered on impulse through the heater ribbon. After the current stops the seal remains under pressure to cool and to give it a clean finish.

(Source: The Hoso Times, published by Nippo Co., Ltd.)

Jan 28, 2013 | Office Equipment & Supplies

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

No gas in carb husqvarna 141 chainsaw


Fuel gets to the carb via the fuel filter in the tank, the fuel hose up to the carb, and the impulse from the engine making the pump diaphram in the carb pulse and pump fuel, so start by replacing the fuel filter in the fuel tank, then check the fuel hose for signs of leaks, the impulse from the engine is fed through a pipe in the carb support block, you will need to remove the carb and block to inspect this, there is also a filter within the carb itself, this is sited under the pump housing of the carb ( alloy cover held with a single screw )

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1 Answer

WHEN I START IT,IT RUNS ONLY THE AMOUNT OF PRIMED ...


Check the fuel filter, air cleaner, and muffler for plugging. Check the condition of the fuel lines for rot, hardness or splitting. Check the carburetor fasteners for tightness. If still no help, remove the carburetor from the engine and check the crankcase impulse passage from the cylinder, through the gaskets and heat isolator block. Inspect the piston skirt and cylinder wall for any serious scoring or other damage while the carburetor is off. Remove the upper chamber cover and inspect the valving and small diaphragm for any cracking or other damage. This chamber uses crankcase pressure impulses to cause the fuel to be pumped from the tank. Hope this helps!

May 17, 2010 | Garden

1 Answer

Husqvarna 14' Model 141 Chain Saw


THE IMPULSE LINE FROM THE CARB TO THE CRANKCASE HAS POSS FAILED, CHECK THE FUEL LINES FOR CRACKS AND PINHOLES, MAKE SURE THE INLET SCREEN INSIDE THE CARB IS NOT BLOCKED, WORSE CASE CENARIO THE ENGINE HAS A BLOWN CRANK SEAL CAUSING THE ENGINE TO RUN VERY LEAN WHICH WILL IN TIME "COOK" THE SAWS RECIPROCATIONG PARTS. AS FOR THE SWITCH ISSUE THE SWITCH ITSELF IS PROB BAD OR THE WIRING HAS COME UNPLUGGED OR IS DAMAGED......GOOD LUCK!

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