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Stout, Alan

From: Stout, Alan

Sent: Monday, July 28, 2014 1:36 PM

To: John McKnight; Lowry, Jeff@ARB; Guerry, William M.; Roger T. Gault; Brian Campbell; Jim 

Watson; Monday, Scott@ARB

Cc: Julia Giuliano

Subject: RE: Draft Regulatory Amendments

Dear colleagues, 

In the file I sent last week with amendments to diurnal emission test procedures for nonroad equipment, we had an 

oversight that led to canister preconditioning specifications that should have applied only for nonmarine fuel tanks. As 

noted below, the text of §1060.525 should include a different preconditioning step for testing marine systems. 

I hope to send around a final file that incorporates all the input from the various parties once the reviews are 

complete. Since this one omission is more substantial than the rest, I want to get the word out sooner to make sure 

everyone had a chance to comment on the intended change to the regulation. 

Alan 

____________ 

§1060.525 How do I test fuel systems for diurnal emissions? 

(a) * * * 

(4) If the fuel tank is equipped with a carbon canister, load the canister with butane or gasoline vapors to its canister 

working capacity as specified in §1060.240(e)(2)(i) and attach it to the fuel tank in a way that represents a typical inuse configuration. Purge the canister as follows to prepare for emission measurement:

(i) For marine fuel tanks, perform a single heating and cooling cycle as specified in paragraph (a)(7) of this 

section without measuring emissions. 

(ii) For nonmarine fuel tanks, establish a characteristic purge volume by running an engine with the fuel tank 

installed to represent an in-use configuration. Measure the volume of air flowing through the canister while the 

engine operates for 30 minutes over repeat cycles of the appropriate duty cycle used for certifying the engine 

for exhaust emissions. Set up the loaded canister for testing by purging it with the characteristic purge volume 

from the engine simulation run. 

From: Stout, Alan 

Sent: Thursday, July 24, 2014 11:26 AM 

To: 'John McKnight'; 'Lowry, Jeff@ARB'; 'Guerry, William M.'; 'Roger T. Gault'; 'Brian Campbell'; Jim Watson 

Cc: Julia Giuliano 

Subject: Draft Regulatory Amendments 

Dear colleagues, 

The attached file includes a variety of draft amendments to the regulations for Small SI engines in 40 CFR part 1054 and 

for Nonroad SI equipment in 40 CFR part 1060. These amendments involve several corrections, clarifications, and minor 

adjustments to the regulations. We do not anticipate that any of these changes add new requirements or involve any 

controversial elements. We therefore intend to include them in a direct final rule that we hope to complete later this 

year. Since this rulemaking process depends on us not receiving adverse comments, we want to share the draft 

language just to make sure people have a chance to weigh in before we go ahead with the published final rule. Feel free 

to share this with others as appropriate to help us make sure everything is on target. 

If we can get any comments on the draft text by August 5 or so, that would keep us on a good track for finishing the rule 

in an orderly timeframe. 
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Thanks for your help. 

Alan 

_______________ 

Alan Stout 

U.S. EPA Office of Transportation and Air Quality 

2000 Traverwood Dr. 

Ann Arbor, MI 48105 

734-214-4805 

734-214-4816 (fax) 

stout.alan@epa.gov 

www.epa.gov/otaq/