What are the symptoms of a bad fuel pump on an outboard motor?

What are the symptoms of a bad fuel pump on an outboard motor?

The symptoms of a bad fuel pump on a boat are engine sputtering at high speeds, poor acceleration under heavy loads, increased fuel consumption, increased engine temperatures, and the engine sounds rough (whine). If you see one of those symptoms, your fuel pump might be causing those problems.

How do you test a Johnson fuel pump?

Start the engine, and monitor the pump cycles by using a fuel pressure gauge or by putting light finger pressure on the outlet hose.

1. At 800 RPM, the oil level in the hose should drop 1″ in approx. 5 pulses.
2. At full throttle, the oil level should drop 1″ in approx. 3 pulses.

How do you test a fuel pump on an outboard motor?

Connect your fuel pressure gauge to the pulse hose. Crank the engine. Normal fuel pumps will put out between five and seven PSI. Readings below this point to a bad diaphragm or pump check valve.

How do I know if my fuel pump is leaking?

Typical Symptoms of a Fuel Pump Leak

1. Poor Gas Mileage. One symptom which will occur with a faulty fuel pump is getting fewer miles per gallon.
2. Starting Issues.
3. Decreased Acceleration.
4. Engine Stalling and Misfiring.
5. Whining Sounds.
6. Gasoline Smell.
7. Engine Overheating.

What causes fuel pump to leak?

Engine Oil Leaks Where the fuel pump mounts to the timing case cover a gasket provides a tight seal. Although this gasket is usually reliable, engine vibration can cause the bolts to come loose. When this happens, oil can seep out around the fuel pump.

How do you know if you need a new fuel pump?

5 Signs You Need to Replace Your Fuel Pump

1. Engine Stuttering. One of the clearest indications that your vehicle’s fuel pump isn’t working as it should is an engine jolts and stutters while you drive at a steady speed.
2. Engine Surges.
3. Reduced Fuel Efficiency.
4. High-Pitched Noises.
5. Engine Won’t Start.

When to rebuild a fuel pump on a Johnson Evinrude boat?

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.

What kind of fuel pump does a Johnson outboard use?

Sierra 18-7353 Fuel Pump for Johnson, Evinrude Outboards Sierra replacement fuel pump for Johnson/Evinrude Outboards. Sierra marine parts are manufactured to meet or exceed OEM requirements.

Do Johnson fuel pumps wear out over time?

Fuel pumps work under high pressure so over time, even Johnson fuel pum ps can wear out and require replacement. When that happens, just give Wholesale Marine a call. We stock quality fuel pumps for most Johnson outboards at very competitive prices.

What is a Johnson/Evinrude 0397839 fuel pump?

Johnson/Evinrude 0397839 Fuel Pump Genuine OEM replacement fuel pump for Johnson/Evinrude outboards. Interchangeable with: Sierra 18-7350 Mallory 9-35350 Boat fuel pumps carry gas from the fuel tank to each engine cylinder. These pumps affect how your outboard burns fuel, and therefore, how much power it can generate.