Price range: $30.00 through $45.00
The Johnson/Evinrude Fuel Pump Cap is available in two different sealing styles used on OMC, Johnson and Evinrude fuel pump assemblies.
The early 330092 cap uses a flat gasket and can be identified by the raised sealing ridge that runs around the inside outer edge of the cap.
The later 433518 cap uses O-rings and can be identified by the recessed groove inside the cap where the O-rings seat.
Cap does NOT include Gasket or O-ring
Choose the version that matches the inside sealing surface of your existing cap.
Always inspect the inside of your existing cap before ordering.
The Johnson/Evinrude Fuel Pump Cap was produced in two different sealing configurations, and choosing the correct version is important for proper fuel pump sealing.
The two caps may look similar from the outside, but the inside sealing surface is noticeably different.
That inside surface is the easiest and most reliable way to determine which version you have. Instead of relying only on engine year, inspect the inside of the cap which is where the biggest difference between the two designs can be seen.
The early cap uses a flat gasket between the cap and fuel pump body. The easiest visual identifier is the raised sealing ridge around the outer inside edge of the cap.
This raised ridge compresses against the gasket to create the seal.
If you see a raised ridge running around the inside perimeter, you most likely have the early gasket-style cap.
The later cap changed from a flat gasket to an O-ring sealing system.
Instead of the raised sealing ridge used on the earlier cap, the later version has recessed groove molded into the inside surface.
These grooves are designed to hold the O-rings in place.
If you see distinct grooves for O-rings, you have the later style.
Raised ridge = Early 330092 gasket-style cap
Recessed grooves = Later 433518 O-ring-style cap
This is the best way to identify the correct version before ordering.
The two caps use different methods to seal against the fuel pump body. The early cap depends on the raised ridge compressing against a flat gasket. The later cap depends on O-rings fitting into recessed grooves.
Using the wrong sealing style can cause:
A gasket-style cap should not be converted to an O-ring setup unless replacing the entire cap assembly, and an O-ring-style cap should not be used with the flat gasket arrangement.
Early 330092 Cap
Later 433518 Cap
Possible symptoms include:
Because these same symptoms can also come from hoses, fittings, the diaphragm, or the fuel pump body itself, inspect the complete assembly during service.
Johnson/Evinrude used both styles over overlapping production periods, which means engine year alone may not always tell you which cap is installed.
Parts may also have been replaced during previous repairs.
For that reason, the safest method is to remove the cap and look at the inside sealing surface.
At Liquid Revolutions, we recommend identifying the part visually before ordering:
Raised ridge = gasket style
Recessed grooves = O-ring style
That simple check can prevent ordering the wrong cap or seal and can save time during fuel pump service.
For performance and racing outboards, a properly sealed fuel pump cap is especially important because fuel demand increases as RPM rises.
A small air leak that may not be noticeable at idle can become a much larger problem under sustained high-RPM operation.
Making sure the correct cap and sealing system are used helps maintain reliable fuel delivery and eliminates one possible source of fuel-system problems.
Whether you are restoring an older Johnson/Evinrude fuel pump or servicing a performance engine, correctly identifying the early or later cap is an important part of proper fuel pump maintenance.
Does not include Gasket or O-Ring
| Weight | N/A |
|---|---|
| Dimensions | N/A |
| Version | Early, Late |
