My 1991 190e was running great, then suddenly died at 55 mph. Its home now but won't start. It has fuel. I can hear the fuel pump run for a few seconds when the key is turned on. I cracked the fuel line at the fuel distributor, and fuel squirts out under pressure so that seems OK. I cracked a line at an injector and while turning over the engine no fuel comes out there. I've pulled the spark plugs, they're fine. I am getting spark to the plugs. Any ideas?