Actually I perfer not to try any thing. I prefer to use the proper testing and replace only what fixes the problem. I have fixed (and writen about) hundreds of cars with fuel leak down. I have fixed and writen about hundreds that wouldn't cold start because of OVP relays; and numerous other problems.
Proper direction, proper testing, equals quick results.
Bosch Master, ASE Master, L1
33 years MB technician