1985/07/01 Caterpillar


Orifice Fitting Or Snubber Can Help Stop Erratic Fuel Gauge Operation

Usage:


3306B, 3406B Truck Engines

A piston-type fuel pump is used on the above engines. This type of fuel pump can cause rapid fluctuation of the indicator in some fuel pressure gauges.

NOTE: Only mechanical fuel pressure gauges are affected. Electric fuel gauges are electrically dampened.

The addition of an orificed fitting or snubber (flexible fuel lines are also recommended) can eliminate the erratic operation of the indicator in the fuel pressure gauge.

Two orificed fittings, the 6V8090 and 5P4837 Orificed Pipe Adapters, are available for use on the fuel pressure gauge lines of the above engines. The two fittings aredifferent lengths, but both have an orifice dimension of 0.80 mm (.031 "). The correct orificed fitting can be installed on either or both ends of the fuel pressure gauge line. The fittings are less than one inch long and have 1/8" NPT.

The above orificed fittings may not control the fluctuation of some non-dampened fuel gauge indicators. In these cases install a 7S3795 Snubber.

Caterpillar Information System:

1985/07/01 Remanufactured Cylinder Head Group For Na Engines Must Not Be Installed On T Engines
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1985/06/01 Caterpillar Announces New 3208 Truck Engine Warranty
1985/06/01 Substantial Price Reduction For Caterpillar Remanufactured Short Blocks
1985/06/01 Successful Settlement Reached Between Caterpillar Tractor Co. And Industrial Parts Depot, Inc.
1985/06/01 Hunting Down The Cheaters
1985/06/01 List Of Service Publications
1985/06/01 Check 5P7435 Tee Adapter Groups In The 6V3100 Engine Timing Indicator Groups
1985/06/01 New Rust Preventive Used In Part Distribution System
1985/07/01 Breather Element Added To PCV Valve
1985/07/01 Engine Air Inlet Adapters
1985/07/01 New Type Of Paint Used On Some Caterpillar Products; Do Not Weld On Painted Surfaces
1985/07/01 Hardened Washers Used In Engine Oil Lines; Locks Removed From Oil Pump
1985/07/01 Special Instruction Available To Salvage Governor Housing
1985/07/01 Substantial Price Reduction For Caterpillar Remanufactured Short Blocks
1985/08/01 Tachometer Drive Is Now An Attachment
1985/08/01 Location Of 6V5135 Setscrews In Fuel Pump Group
1985/08/01 New Service Tools Available
1985/08/01 New Format For Some Special Instructions
1985/08/01 New, Corrosion Resistant Water Pump Shaft Available
1985/08/01 Thread Lock Now Used On Timing Advance Bolts
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