Fuel Injection Diagnostic Set With these sets, you can quickly and accurately diagnose fuel pressure problems on Chrysler, Ford, GM, or Jeep engines that have multi-port fuel injection systems. You can also bleed air from the system with the bleed valve. No. 7211 gauge assembly allows technicians to check fuel pressure and fuel volume. No. 7635A Includes: No. 7430 quick-disconnect 90° elbow fitting, and No. 7272 Ford EFI quick-disconnect fitting.