Exhibit 23.3 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-8 of Delta Petroleum Corporation of the Delta Petroleum Corporation Annual Report on Form 10-K for the fiscal year ended December 31, 2006, which includes our name and information regarding our review of the reserve estimates for Delta Petroleum Corporation. RALPH E. DAVIS ASSOCIATES, INC. /s/ Allen C. Barron Allen C. Barron, P.E. President Houston, Texas March 9, 2007