Fuel Pressure Specifications; Fuel Requirements; Fuel Ratings; Using Reformulated (Oxygenated) Gasoline (Usa Only) - Mercury MerCruiser Service Manual

Special Tools
Clamp Tool
Fuel Pressure Gauge Kit
Digital Pressure Meter

Fuel Pressure Specifications

Conditions
Approximate fuel pressure at idle
Approximate fuel pressure engine not running

Fuel Requirements

Running out of fuel can damage catalyst components. Do not allow the fuel tanks to become empty during operation.
IMPORTANT: Use of improper gasoline can damage your engine. Engine damage resulting from the use of improper
gasoline is considered misuse of the engine and will not be covered under the limited warranty.

Fuel Ratings

Mercury MerCruiser engines will operate satisfactorily with any major brand of unleaded gasoline that meets the following
specifications:
USA and Canada ‑ A posted pump octane rating of 87 (R+M)/2, minimum, for all models. Premium gasoline 91 (R+M)/2
octane is also acceptable for all models. Do not use leaded gasoline.
Outside USA and Canada ‑ A posted pump octane rating of 91 RON, minimum, for all models. Premium gasoline (95 RON) is
also acceptable for all models. Do not use leaded gasoline.

Using Reformulated (Oxygenated) Gasoline (USA Only)

Reformulated gasoline is required in certain areas of the USA and is acceptable for use in your Mercury Marine engine. The
only oxygenate currently in use in the USA is alcohol (ethanol, methanol, or butanol).
90-8M0099748 eng DECEMBER 2015
Used to clamp high pressure (Oetiker ®) hose clamps. Part of Clamp Tool Kit
(91‑803146A4).
39648
Tests the fuel pump pressure; can be used to relieve fuel pressure.
2807
Connects to the fuel system/manifold and can be used in conjunction with
Computer Diagnostic System (CDS).
5786
91‑803146T
91‑881833A03
91‑892651A01
Reading on Fuel Pressure Gauge
NOTICE
© 2016 Mercury Marine
MPI ECT Fuel System
280–310 kPa (40.6–45.0 psi)
340–370 kPa (49.3–53.7 psi)
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