EXHIBIT 23.3 RALPH E. DAVIS ASSOCIATES, INC. CONSULTANTS-PETROLEUM AND NATURAL GAS 1717 ST. JAMES PLACE-SUITE 460 HOUSTON, TEXAS 77056 (713) 622-8955 CONSENT OF RALPH E. DAVIS ASSOCIATES, INC. The Board of Directors Delta Petroleum Corporation We hereby consent to the incorporation by reference in this Registration Statement on Form S-3 of Delta Petroleum Corporation and in the related Prospectus (collectively, the "Registration Statement") of the Delta Petroleum Corporation Annual Report on Form 10-K for the year ended June 30, 2004, which includes our name and information regarding our review of the reserve estimates or Delta Petroleum Corporation. We further consent to the use of our name in the "Experts" section of the Registration Statement. RALPH E. DAVIS ASSOCIATES, INC. /s/ Allen C. Barron Allen C. Barron, P.E. President Houston, Texas May 31, 2005