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Old 03-21-2010, 09:30 PM
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no start in a bus

my dad bought an e450 bus for cheap its complete and was running when it was parked. He is planning on swapping it into a 78 ford truck hes got. i did a search and couldnt find what I wanted. Im a cummins guy so please don't beat me up to bad. I could figure this out lickety split if it was an old 12valve, but this thing has got me stumped. He got the battery charged up good and went out and tried to start it. The tank has good fuel in it and the frame pump is pumping fuel up to the fuel filter assembly. The motor cranks over fine and the oil pressure comes right up good. The wait to start light comes on and goes out. The computer talks to the scan tool no problem and when I did the injector buzz test all 8 buzzed no problem. It just wont fire up I dont know if its the CPS or not. He shot some ether in the intake and all she'll do is bark back thru the intake. Any help you could send my way would be greatly appreciated the short bus has me stumped! Thank you in advance!
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Old 03-22-2010, 10:25 AM
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Don't use ether while the glow plug system is functional. The ether will hit a hot glow plug and ignite - and if its in the wrong part of the cycle, you can bend valves or break things.

The 7.3 uses high pressure oil to fire the injectors. Check the HPOP reservoir (the rectangular thing in front of the filter assembly to make sure it has oil in it. Sometimes they drain down when its been sitting forever.

The CPS is a cheap first step. Never hurts to have a spare.
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Old 03-22-2010, 05:03 PM
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Thank you. Yea the ether will pop in a cummins too when it hits the grid heaters I never gave the glow plugs a thought! I'll pick up a cps just in case its kind of a bear being in the bus. How do u check the oil in the hpop? It has been sitting for quite awhile. So the oil draining back could be a definite possibility. Thank you again for the information!
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Old 03-22-2010, 05:22 PM
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There's a hex plug on the top of the rectangular shaped reservoir. You need the oil to be within about an inch from the top. Any extra you put in just flows back to the pan. Make sure and put the plug back in before starting or you'll have a geiser. You can change the CPS from the bottom of the vehicle. Shouldn't be hard.
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