Johnson outboard fuel pump test

You may have to do a little research for your model but most outboards with VRO oil pumps have the second option for a fuel pump only. Find great deals on eBay for evinrude fuel pump.

Often other fuel system components are easier to troubleshoot and eliminate.

Johnson outboard fuel pump test. Ok lets test the pump. Using diagragm for reference install and carefully secure a 10 length of 14 clear vinyl hose to oil inlet on pump. A few inches from the loose end measure carefully and mark hose every 12 for 3 inches.

Fill the hose with outboard oil and run the engine to eliminate air from the base of the hose. You can check this by pumping the primer bulb until it feels hard. Fuel should travel easily from the tank all the way to the pump.

Your outboard fuel filter located just before the fuel pump should be full. With the engine off and the cowl cover removed remove. The outboard fuel pump has a sensitive diaphragm that receives a suction signal from a piston cylinder so the pump can deliver fuel.

If the cylinder has a leak the pump pulse signal will not be strong enough to send the proper amount of fuel to the cylinder. Outboard fuel pumps rarely fail and diagnosing a fuel problem involves checking other components that can be easily mistaken for a bad check valve or diaphragm in a fuel pump. Often other fuel system components are easier to troubleshoot and eliminate.

However if you want to get right to the outboard fuel pump we have the steps you need to know. How Do You Test a Bad Outboard Fuel Pump. Turn off the main electrical cutoff switch.

Just before the fuel pump some clear hose also at the fuel pump inlet and a pressure gauge at fuel pump outlet. The sketch in figure 2 shows a typical V4 outboard fuel system. With gauges inserted using Tee fittings and some clear hose it is then just a matter of operating the motor at maximum fuel flow wide open throttle and note the.

Check fittings to this unit and remove the hose to the pump side and crank the engine again checking for pressure and vacuum if not this needs replacement if its good replace hoses check fittingsIf all is good to this point you have a gas delivery problem not the pulse line. Easy to test. Disable ignition so motor cant start disconnect fuel pump outlet hose and direct the outflow to a pail.

Crank motor over with starter. You should get strong fuel pulses. Feeble pulses suggest a bad fuel pump.

A compression test will tell you if the motor is shot. As i understand it the fuel pump is operated by pulses from positive pressure within the crankcasethis occurs when the piston travels downward if you have two cylinders operating correctly and two not i would consider carbs or ignition. But do a compression test to be sure.

VRO Replacement Fuel Pump Assembly Fits Johnson Evinrude 150hp 1991-2006 175hp 1991-2006 60 degree VRO outboards This is a cheaper alternative to the following VRO pumps. 174955 435555 438400 5004558 5007420 5007422 8402-60. The fuel pump on the outboard is responsible for pumping fuel from the gas tank to the carburetor which in turn powers the boat and enables it to accelerate when the throttle is increased.

If the Johnson sputters while it is running at higher speeds it could mean that the fuel pump is going bad. Johnson Evinrude Small Outboard Fuel Pump Rebuild - Repair or Service. It will be between the starter and the main battery connector positive.

You may have to do a little research for your model but most outboards with VRO oil pumps have the second option for a fuel pump only. There should be a small bolt sealing the impulse port and two. How to Troubleshoot the Fuel Pump on a 50 HP Johnson Outboard.

The most accurate method for troubleshooting the fuel pump on your Evinrude is to test the pump with a low-pressure fuel gauge while running the motor at various speeds with the propeller attached. In this video I quickly go through how to testing the water pump in an outboard motor. The main tips are having the outboard deep enough in the water and mak.

If it does not pass this test something went wrong in the assembly. Most likely the air cap spring is either in the wrong cavity or is slightly out of place. If it passes this test then you have completed the the outboard fuel pump rebuild.

You can now mount the finished OMC fuel pump on your engine and test. If you feel you need to test the fuel pump pressure for these motors the factory specs call for 1 psi 600 rpm 15 psi. 2500 to 3000 rpm and 25 psi 4500 rpm.

If with the motor running you happen to have fuel spraying out the small hole on the back of the fuel pump you have a ruptured fuel pump. Fuel Pump Rebuild Kit for Johnson Evinrude Outboard. A fuel pump rebuild kit is needed every so often with outboard motors.

The inner rubber diaphragm can develop cracks or pin holes that effect proper fuel flow and inner check valves and springs can break causing complete pump failure. Older motors can have pre-ethanol components that should be. 2003 Johnson 4 Stroke Bombardier fuel injection electronic ign.

When you get the manual check the high pressure fuel pump pump is inside small tank on side of engine. Regulator also inside the tank. Key on you should hear pump run for a few seconds.

You didnot state horsepower of engine. That info is needed. Get help with testing various components of your outboard boat motor including fuel ignition cooling and fuel syatems.

DIY inboard outboard boat motor parts accessories Johnson Evinrude Mercury Mariner Force Chrysler Yamaha Mercruiser OMC Cobra. VRO Replacement Fuel Pump Assembly Fits Johnson Evinrude 90 100 115hp V4 60 degree VRO outboards This is a cheaper alternative to the following VRO pumps. 174955 435555 436203 438400 5004558 5007420 5007422 8402-460.

R ecommended Fuel Oil Mix. On these 2 cycle motors you have to mix the oil with the gasoline to lubricate the internal parts of the motor so you need to know how much gas you will be needing add the oil before you fill the fuel tank so that the oil mixes better than just dumping it in after you fuel up. However if that is not possible then guess add a majority of what you think it will take top off the tank.

Fuel Pump Rebuild Kit for Johnson Evinrude Outboard. A fuel pump rebuild kit is needed every so often with outboard motors. The inner rubber diaphragm can develop cracks or pin holes that effect proper fuel flow and inner check valves and springs can break causing complete pump failure.

Find great deals on eBay for evinrude fuel pump. The video below describes how to check vintage Johnson Evinrude OMC outboard ignition coils for functionality. First in order to properly test the coil you need to remove it from the ignition plate.

The secondary winding should have between 3000 ohms to 8000 ohms or 3 KOhms to 8 KOhms resistance.