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After truck had been setting for several days, tried to start. Ran rough, like a gas engine w/ignition problems. Tach dropped to zero several times ( engine was running). Has new lift pump, but was not running, applied 12V directly to pump and it runs fine, I have fuel to filter. Fuse and relay are working. Check voltage at pump harness, shows about 8 volts. Don't have access to diagnostic tools.
Thanks for any help.
 

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mine i had to put a crank shaft sensor in. i am not positive i know my tach would drop to 0 i hope that helps
 
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