SwRI: ASTM D5598 Port Fuel Injector Deposit Procedure

	Today's unleaded gasolines have been developed to virtually eliminate the formation of harmful deposits on fuel injectors, but fuels vary in their ability to control deposits on intake valves and in combustion chambers.

The ASTM D5598 Port Fuel Injector (PFI) Deposit Procedure evaluates the tendency of a gasoline to keep the port fuel injectors clean.

Port Fuel Injector Deposit Test Procedure

A 1985-87 Chrysler 2.2-L turbocharged engine with an automatic transmission is used for this procedure. The test cycle consists of:

• F55 miles per hour for 15 minutes

• Engine off, hot-soak for 45 minutes

• Flow test injectors every 1,000 miles for a total test length of 10,000 miles

The fuel requirement for this test is 500 gallons, and the duration is 40 days. The PFI test is a pass if the fouling of all injectors remains 5% or less for the entire test.

A modified version of this procedure is available to evaluate the tendency of a gasoline to clean fouled port fuel injectors. The procedure for this test is as follows:

	(top) Clean-up phase; (bottom) Dirty-up phase

• For the dirty-up phase, run 15/45 cycle, and

   flow test until at least one injector is fouled to greater than 10%.

• For the clean-up phase, run 15/45 cycle, and flow test until fuel injector fouling is 5% or less.

Clean-up is confirmed when the fouling of all four injectors becomes 5% or less.

For more information about ASTM D5598 port fuel injector deposit procedure capabilities at SwRI or how you can contract with SwRI, please contact Kevin Brunner at kbrunner@swri.org or (210) 522-3579, or contact Frank Stains at fstains@swri.org  or (210) 522-5984.