1999 E7 won't start

[dkesler]

It has 80psi at the filter while cranking but won't start. Ether it and it fires and runs all day. Sometimes it will start the first thing in the morning but shut it off and it won't start without ether forthe rest of the day. The starter is cranking it plenty fast. My guess is it is not being told to inject fuel during the starting process. It is the gray engine and we switched computers with a 1998 E7 and the 1999 computer will start the 1998 but not vice-versa.

[fjh]

Codes ????

[jklj]

Check and see if you have 12 volts going through the silenoid under the dash panel by the circuit breakers we have had the same problem you described

[fullfuel01]

Really looks like a voltage problems

[turckster]

Check the ground relay, it may be popping open when cranking the engine. This is usually cause by a bad starter pulling too much amperage or internally shorted. Had one eat my lunch doing practically the same thing when I came across the bad relay and starter.