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 MaxxForce 7 Cranks but no start
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1983ChevroletWayne
Senior Member

Canada
165 Posts

Posted - 01/19/2014 :  5:58:57 PM  Show Profile  Reply with Quote
Hey guys,

One of my fellow drivers drives an IC CE (08' or 09' I believe...Sorry I can't remember!) with the MaxxForce 7.

The other morning his bus had quit on the side of the road about a mile from his house, and acted like it had run out of fuel (even though it had a 1/2 a tank). The bus was towed back to the shop and the boys began working on it. It would crank and crank but not start. The water separator was removed (and half full of water!) and the upper fuel filter was replaced. After the filters were changed the bus still will not start. It will crank and crank, but not kick over. If the system is manually primed it will run for about 5 seconds, then chug and stall.

All the fuel lines seem tight with no fuel leakage or diesel fuel smell. The engine builds lots of oil pressure while cranking. Someone at the shop had mentioned maybe an air lock?

I found a blog on the Maxxforce 7 that stated:

"When changing the fuel filters cycle:

key on 10 seconds
key off 15 seconds
key on 10 seconds
key off 15 seconds
key on 10 seconds"

So i'll pass this info onto them tomorrow.


Any other tips?

Thanks!

Fastback
Top Member

990 Posts

Posted - 01/20/2014 :  05:15:16 AM  Show Profile  Reply with Quote
The key on, key off cycles may only apply to engines with electric fuel pumps, likely does not apply to that vintage engine.

Why yes, the ORIGinal CHARGER is a Fastback
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1983ChevroletWayne
Senior Member

Canada
165 Posts

Posted - 01/20/2014 :  09:03:41 AM  Show Profile  Reply with Quote
quote:
Originally posted by Fastback

The key on, key off cycles may only apply to engines with electric fuel pumps, likely does not apply to that vintage engine.



Yeah, we tried it this morning and it was no help.

On the laptop it says the FRP is 0% when cranking. The guys have looked at all the relays and fuses, and everything seems to be alright.

Formerly "83ChevroletWayne"



Pic courtesy of: "schoolbusdriver.org"

Edited by - 1983ChevroletWayne on 01/20/2014 09:07:01 AM
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1983ChevroletWayne
Senior Member

Canada
165 Posts

Posted - 01/21/2014 :  08:07:38 AM  Show Profile  Reply with Quote
Turned out to be the FRP (Fuel Rail Pressure) sensor.

Formerly "83ChevroletWayne"



Pic courtesy of: "schoolbusdriver.org"
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1983ChevroletWayne
Senior Member

Canada
165 Posts

Posted - 01/23/2014 :  08:12:08 AM  Show Profile  Reply with Quote
quote:
Originally posted by 1983ChevroletWayne

Turned out to be the FRP (Fuel Rail Pressure) sensor.



Sensor was replaced, but still not working. Looks like they will be looking at the fuel pump next.

Formerly "83ChevroletWayne"



Pic courtesy of: "schoolbusdriver.org"
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1983ChevroletWayne
Senior Member

Canada
165 Posts

Posted - 01/28/2014 :  6:05:57 PM  Show Profile  Reply with Quote
Pump full of metal shavings and broken parts! I guess they found the problem!

Formerly "83ChevroletWayne"



Pic courtesy of: "schoolbusdriver.org"
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