I have a 1994 volvo 5.0 fi. Sometimes the fuel pumps come on, sometimes they don't. Changed pump relay, same problem. Then I started messing with battery switch and on 1 or 2 it rarely works but on all it seems better. It cranks but no start, so maybe there is no spark either during this. Would a bad ground cause this? Sometimes it runs until its out of gas, other times it just shuts off because the ignition cuts out.
