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Removal
IMPORTANT: Follow the recommendations of the fuel pressure gauge manufacturer for the correct procedure for relieving
pressure from the system.
1. Relieve the pressure from the fuel system.
2. Remove the fuel pressure gauge from the engine.
3. Install the Schrader valve cap.
Checking for Restrictions/Vapor Lock Problems in Fuel Delivery Systems
If there are any restrictions in the fuel delivery system the engine may experience vapor lock and other driveability problems.
Fuel supply problems can be checked by using a vacuum gauge on a water‑separating fuel filter fitting port. Installing it on the
inlet side will check the fuel tank to filter supply line and hardware (anti‑siphon valve, fuel fittings, etc.). Installing it on the outlet
side will check the supply line, hardware, and the filter. If the outlet vacuum reading is higher than the inlet reading, the filter is
clogged. If both readings are high then inspect the fuel tank, supply line, and hardware. Check for debris in the tank (blocking
the pickup), clogged fuel filter screens on the end of pickup tubes in the tank, clogged in‑line fuel filters, blocked off fuel tank
vent, bent pickup tube, dirt and debris in the fuel fittings, wrong size fuel fittings (undersize connector fittings, undersize fuel
shut‑off valve passages, etc.), undersize fuel line, or a malfunctioning anti‑siphon valve.
a -
Fuel tank
b -
Clear hose can be used to check for air bubbles
c -
T‑fitting
d -
Digital vacuum gauge
e -
Water‑separating fuel filter
f -
Fuel pump (mechanical or electric ‑ depending on fuel system)
g -
EFI fuel system
There is a MerCruiser specification for allowable vacuum, when measured at the inlet side of the engine‑mounted MerCruiser
water‑separating fuel filter or if there is none mounted on the engine, at the inlet side of a fuel pump. Use a digital vacuum
gauge (an analog gauge may not give accurate enough readings at these low levels) that reads in either kPa (kilopascals) or in.
Hg (inches of mercury).
The specification is: 7 kPa (2 in. Hg) maximum at: idle, 3000 RPM, full throttle and then back at idle RPM (check at each point).
Any anti‑siphon valve or restriction that causes a higher reading can contribute to vapor locking and other driveability problems.
In hot weather, if you see 0 vacuum on the gauge and the engine is still running poorly, check the inlet fuel line to ensure that a
good solid flow of fuel is in the line, instead of a mixture of fuel and vapors. If the vacuum is too high, try a less restrictive
anti‑siphon valve. Restrictive anti‑siphon valves can cause vapor locking conditions.
b
c
29509
e
f
d
g
a
MPI ECT Fuel System
90-8M0099748 eng DECEMBER 2015
© 2016 Mercury Marine
Page 5A-31
Содержание MERCRUISER
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Страница 6: ...90 8M0099748 eng DECEMBER 2015 2016 Mercury Marine Page iv...
Страница 12: ...General Information Notes Page 1A 6 2016 Mercury Marine 90 8M0099748 eng DECEMBER 2015...
Страница 70: ...Maintenance Notes Page 1C 54 2016 Mercury Marine 90 8M0099748 eng DECEMBER 2015...
Страница 96: ...Troubleshooting Notes Page 1D 26 2016 Mercury Marine 90 8M0099748 eng DECEMBER 2015...
Страница 156: ...Installation Notes Page 2B 52 2016 Mercury Marine 90 8M0099748 eng DECEMBER 2015...
Страница 202: ...Engine Disassembly Notes Page 3A 46 2016 Mercury Marine 90 8M0099748 eng DECEMBER 2015...
Страница 286: ...Engine Troubleshooting Notes Page 3C 14 2016 Mercury Marine 90 8M0099748 eng DECEMBER 2015...
Страница 298: ...Starter Motor Exploded View 1 2 3 4 56738 Starting System Page 4A 4 2016 Mercury Marine 90 8M0099748 eng DECEMBER 2015...
Страница 314: ...Waste Spark System Notes Page 4B 8 2016 Mercury Marine 90 8M0099748 eng DECEMBER 2015...
Страница 330: ...Charging System Notes Page 4C 16 2016 Mercury Marine 90 8M0099748 eng DECEMBER 2015...
Страница 347: ...Instrumentation and Controls Notes 90 8M0099748 eng DECEMBER 2015 2016 Mercury Marine Page 4D 17...
Страница 404: ...MPI ECT Fuel System Notes Page 5A 34 2016 Mercury Marine 90 8M0099748 eng DECEMBER 2015...
Страница 424: ...All Models Notes Page 6A 20 2016 Mercury Marine 90 8M0099748 eng DECEMBER 2015...
Страница 428: ...Models with Standard Cooling Notes Page 6B 4 2016 Mercury Marine 90 8M0099748 eng DECEMBER 2015...
Страница 448: ...Models with Closed Cooling Notes Page 6C 20 2016 Mercury Marine 90 8M0099748 eng DECEMBER 2015...
Страница 458: ...Glycol Circuit Inboard In line h 59982 Water Flow Diagrams Page 6D 10 2016 Mercury Marine 90 8M0099748 eng DECEMBER 2015...
Страница 462: ...Water Flow Diagrams Notes Page 6D 14 2016 Mercury Marine 90 8M0099748 eng DECEMBER 2015...
Страница 474: ...Important Information Notes Page 7A 12 2016 Mercury Marine 90 8M0099748 eng DECEMBER 2015...
Страница 477: ...Manifolds and Elbows Notes 90 8M0099748 eng DECEMBER 2015 2016 Mercury Marine Page 7B 3...
Страница 503: ...Power Assisted Steering Pump and Related Components Notes 90 8M0099748 eng DECEMBER 2015 2016 Mercury Marine Page 8A 3...
Страница 526: ...Power Assisted Steering Pump and Related Components Notes Page 8A 26 2016 Mercury Marine 90 8M0099748 eng DECEMBER 2015...
Страница 538: ...Compact Hydraulic Steering Notes Page 8B 12 2016 Mercury Marine 90 8M0099748 eng DECEMBER 2015...
Страница 558: ...Notes Color Diagrams Page 10A 2 2016 Mercury Marine 90 8M0099748 eng DECEMBER 2015...
Страница 559: ...Notes Color Diagrams 90 8M0099748 eng DECEMBER 2015 2016 Mercury Marine Page 10A 3...
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