Quantum Fuel Systems Technologies Worldwide (QTWW) S-3 Shelf registration

Exhibit 23.3

Consent of Independent Registered Public Accounting Firm

We consent to the incorporation by reference in this Registration Statement on Form S-3 of Quantum Fuel Systems Technologies Worldwide, Inc. of our report dated July 28, 2006, except for the 14^th paragraph of Note 4 as to which the date is July 16, 2007, relating to our audit of the consolidated financial statements and the financial statement schedule as of and for the year ended April 30, 2006, which appears in the Annual Report on Form 10-K of Quantum Fuel Systems Technologies Worldwide, Inc. for the year ended April 30, 2007.

We also consent to the reference to our firm under the captions "Experts" in the Prospectus, which is part of this Registration Statement.

/s/    MCGLADREYAND PULLEN, LLP

Irvine, California

July 16, 2007