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Old 09-07-2016, 10:15 PM   #21
Almost There
Join Date: Sep 2015
Location: Salt Lake City, Ut
Posts: 83
Year: 98
Coachwork: Thomas
Chassis: D
Engine: 7.2L turbo Cat C7 3126
Rated Cap: 84
Originally Posted by Booyah45828 View Post
You probably just needed to pump the remaining air out. The lift pump on these are mechanical on the backside of the injection pump. You most likely lost prime through the filters and fuel lines leading up to the pump which is why it wouldn't start.

If I remember right, the regulator has a small hole in it to bleed off air and a spring loaded valve to control fuel pressure.

As far as cracking lines to release air, there are no injection lines to crack on a heui engine.

Mechanically, all you have to do is provide fuel to the lift pump, and oil pressure to the injection pump, and it should light off. If it doesn't, then you check the computer.
The regulator was damaged, it was not maintaining the correct pressure.
gobygoby is offline   Reply With Quote
Old 09-08-2016, 08:16 AM   #22
Bus Geek
Join Date: May 2009
Location: Columbus Ohio
Posts: 8,934
Year: 1991
Coachwork: Carpenter
Chassis: International S3800
Engine: DT360
Rated Cap: 7 Row Handicap
I know on my mechanical DT360 I have an issue where apparently the fuel evaporates on portions of the lines when the bus sits Hot.. so i somet9mes have to re-prime the lift pump since the pump is in the engine bay and not a pusher pump.. if your fuel system isnt 100% tight it can cause the fuel to bleed down.. a bad regulator could cause that as well if the check valve in it is no good..

cadillackid is offline   Reply With Quote

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