['CMV Parts and Maintenance']

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06/03/2026

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CMV Parts and Maintenance -

§393.67 Liquid fuel tanks

RegSense Fleet Safety Federal Motor Carrier Safety Administration (FMCSA), DOT CMV Parts and Maintenance Focus Area Compliance Docs Standard Interpretation English Transportation USA

Question 1: May a properly vented fuel cap be used on a fuel tank equipped with another fuel venting system?

Guidance: Yes (see §393.3).

Question 2: Do the FMCSRs specify a particular pressure relief system?

Guidance: No, but the performance standards of §393.67(d) must be met.

Question 3: What standards under the FMCSRs must be met when a liquid fuel tank is repaired or replaced?

Guidance: A replacement/repaired tank must meet the applicable standards in §393.67.

['CMV Parts and Maintenance']

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