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Im a dedicated do-it-yourselfer but am at a loss. The fuel pump gets affected by the damaged diaphragm or one-way valves so check them and.
Screw a compression gauge hose into the spark plug hole.
Mercury outboard fuel pump test. 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. A gage works better but theyre hard to find in the 0 to 15 psi range. PRESSURE not flow is what youre looking for.
The hand squeezed bulb will deliver 15 psi and more where the fuel pump makes only about 4 to 6 psi max. 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. How to Test an Outboard Fuel Pump.
Turn off your main electrical cutoff switch that governs motor ignition. Screw a compression gauge hose into the spark plug hole. Refer to your owners manual for the correct psi your engine needs.
Check to make sure you have enough gas in the tank to be picked up by the sump. First start the fuel pump testing by turning off the outboard engines power. Then disconnect and remove the cowl cover the plug spark plug wire boot.
Now you should check the compression gauge reading and if the gauge reading shows less or above 30 PSI the compression gauge needs to replace. The fuel pump gets affected by the damaged diaphragm or one-way valves so check them and. Bench Test High Pressure Fuel Pump Drain the VST tank and remove fuel inlet hose and refill the VST tank with Mercury powertune or BRP carbon guard and let set several days.
After setting reconnect the electrical terminals and turn key on and off rapidly to see if pump will jog free if not replace it. Also clean pressure regulator. A break through by CDIRAPAIR 511-9710 allows you to test most Mercury Outboard Mariner Chrysler triggers and OMCs Quick Start timer bases on the engine.
The Unit can be used to test points preamp triggers Mercury Outboard battery CD triggers hall effect triggers Alternator driven Ignition triggers and can be used to check injection Pulse from Mercury Outboard EFI modules. 1977 Mariner Outboard 20 M CARBURETOR WMC 9. Fuel pump diaphragm replacement mercury outboard 110 my last test run of this motor lead me to believe i had fuel pump issues in this video i replace the fuel pump gaskets and diaphragm check.
Mercury Outboard Motor Parts Diagram Mariner Outboard Parts Diagram Awesome Water Problems. Fuel Pump Rebuild Kit for Mercury Mariner 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. 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. Clean fuel pump housing check valves pulse chamber and pump base in solvent and dry all but check valves with compressed air.
Inspect each check valve for splits chips and for proper sealing against pump hous-ing. Inspect boost springs for weakness or breakage. Inspect fuel pump housing pulse chamber and base for cracks or rough gasket sur-.
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Motorcycle GY6 Fuel Pump. Fuel Pump Mercury 25-60hp 4cyl 4 Stroke Yamaha F25-F60hp 95-04 Cross Ref. 26398 62Y-24410-00-00 62Y-24410-01-00 62Y-24410-02-00 62Y-24410-03-00 62Y-24410-04-00 826398A1 826398A3 826398T3 Mfg Part.
2004 MercuryYamaha 4-stoke EFI 115hp EXLPT OT812944 1950hrs. Hey guys questions for you outboard wizards regarding low pressure fuel pumps Heres the situation. Ran down to the rockpile yesterday 1 YT in boat 1 released boat ran great on the way downWhen I began to come off the throttle the engine started to sputter and die at 3000 RPM.
From 2005 Wondertec has always been focusing on Fuel pump researchdevelopment and production for ATV UTV Golf CartOutboard engineMotorcycleWe developed the electric auxiliary water pump and brake vacuum pump from 2016. MARINER FUEL PUMP APPLICATIONS STAND-ALONE FUEL PUMPS ONLY For Carb-mounted pumps see Carb Kit listings. 4 45 HP.
- Some late pumps with straight fittings are sealed 1-piece no kit made 53245A1. 6 HP Model 60–2387383 BELOW.
Find PUMP KIT-FUEL - 14360A73 here. 3 In Stock - Ships Immediately. Offering discount prices on OEM Mercury Marine parts for over 50 years.
Jun 04 2020 by Gary. Great right part work great Great right part work great May 15 2020 by Danny. The fuel pump was what I ordered.
Im a dedicated do-it-yourselfer but am at a loss. I have a 1996 90 HP mercury elpto thats giving problems. This boat has some issues when power is added.
It hesitates and then stays at low rpms. To date Ive confirmed fresh fuel with no H20 in it put new gaskets in the fuel pump changed an ignition coil and changes the spark plug wires. If you notice a rating from the compression gauge at less or more than what is rated for your outboard it is time to replace the fuel pump.
This test may require another person to crank the engine while you look at readings but this can help find the source of unwanted vibrations. Using a DDT Digital Diagnostic Tester or a CDS Computer Diagnostic System is the best way to properly diagnose your DFI Injectors. Since most customers dont have these expensive tools the next best thing is an ohm meter.
The Ohms test is not always conclusive. A DFI Injector can test OK with the Ohms test yet it could still be faulty. Originally posted by rodbolt17 View Post.
Loss of fuel in the VST AND excessive fuel in the oil sump. A quick test you ask. Simply unbolt it leaving the fuel lines attached.
If fuel leaks its ruptured if it doesnt its ok.