Centinel System - Repair Manual - 006-020 Fuel Inlet Restriction

Measure

With Pressurized Fuel Filtering

With Vacuum Fuel Filtering

Measure

TOC

With Pressurized Fuel Filtering

Connect a vacuum gauge to the suction side Compuchek® fitting on top of the integrated fuel system module.

SMALL | MEDIUM | LARGE

Operate the engine at rated speed no load.

Observe the reading on the gauge.

Measurements
		mm-hg	in-hg
Fuel Inlet Restriction	Clean Suction Filter	203	8
	Dirty Suction Filter	305	12

If the restriction exceeds the specifications, correct the restriction in the suction filter, lines, heaters, or fuel tank. Refer to the OEM troubleshooting and repair manual.

SMALL | MEDIUM | LARGE

Remove the fuel supply hose.

Install a vacuum gauge, Part Number ST434, using adapter, Part Number ST434-2.

SMALL | MEDIUM | LARGE

Hold the vacuum gauge at the same level as the fuel inlet connection.

Operate the engine at rated speed no load.

Observe the reading on the gauge.

Measurements
	mm-hg	in-hg
Maximum Inlet Restriction (With Clean Suction Filter)	127	5

If the restriction exceeds the specifications, correct the restriction in the suction filter, lines, heaters, or fuel tank. Refer to the OEM troubleshooting and repair manual.

SMALL | MEDIUM | LARGE

With Vacuum Fuel Filtering

Remove the fuel supply hose to the integrated fuel system module.

Remove the inlet filter screen, if equipped. Refer to Procedure 005-073..

Install a vacuum gauge, Part Number ST-434, using adapter, Part Number 3375845, and hose, Part Number 3376922.

NOTE: Use the appropriate hose adapter for the specific engine as described in the Service Tools list in the Troubleshooting and Repair Manual, Signature Engines, Bulletin Number 3666239.

SMALL | MEDIUM | LARGE

Hold the vacuum gauge at the same level as the integrated fuel system module connection.		SMALL \| MEDIUM \| LARGE

Operate the engine at high idle and no load.

Observe the reading on the vacuum gauge.

Fuel Inlet Restriction
	mm-hg		in-hg
Without remote fuel filter		76	MAX	3
With remote fuel filter		254	MAX	10

If the inlet restriction measured at the fuel supply connection is above specification, the OEM fuel supply lines, remote mount filter, or remote mount priming pump (if equipped) is obstructed.

If the inlet restriction at the fuel supply connection is below specification, the inlet pre-filter should be inspected for debris and/or the fuel filter changed.