Service Manual

ISB, ISBe and QSB (Common Rail [...] Fuel Drain Line Restriction
Section 6 - Injectors and Fuel Lines - Group 06 Page 6-21
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Marine Applications
CAUTION
Use caution when disconnecting or removing fuel
lines, replacing filters and priming the fuel system
that fuel is not spilled or drained into the bilge area.
Do not drop or throw filter elements into the bilge
area. The fuel and fuel filters must be discarded in
accordance with local environmental regulations.
Remove the pipe plug from the fuel drain connection.
Install a Compuchek™ fitting.
Attach a pressure gauge to the Compuchek™ fitting.
Initial Check
Automotive and Industrial
Operate the engine at cranking or low idle and measure
the fuel pressure.
Observe the reading on the gauge.
Allowable Drain Line Restriction
kPa psi
20.0 MAX 2.9
If the fuel drain line restriction is too high, check:
1 O.E.M fuel lines to the tank for proper size, leaks,
bends, or clogs
2 Fuel drain valves for restrictions or plugging (marine
applications only)
3 Fuel tank vents for plugging.
Marine Applications
Operate the engine at rated no-load rpm and measure the
fuel pressure.
Observe the reading on the gauge.
Allowable Fuel Drain Line Restriction (Marine
Engines)
kPa in Hg
14.0 MAX 4