Uh oh....Fuel pressure issue

wayneswirld2 · February 19, 2010, 01:17:15 PM

As for a module...there is a black box with connectors on the right side of it that is mounted sort of beneath and forward of the turbocharger, between the banks. Looks like a module of some sort. Smells like a module, tastes like a module...must be a module.

I'm guessing that this would be some sort of ECM for the fuel delivery system? Dagnabbit, am I gonna be looking for one of these in a bus boneyard?

Wayne

PCC · February 19, 2010, 01:43:50 PM

Do not presume it even could be the ECM until you have exhausted every other possibility.

Make sure that your fuel is running through the rack. Make sure you have everything else working. After looking at everything, find a dealer who can 'test' your ECM, before putting your millions on the table.

I was just mentioning that it might be an un-fuel related problem (one possibility).

It just happened to be my personal situation.

Keith
PCC

wayneswirld2 · February 19, 2010, 03:50:28 PM

I'm all too aware of ECM problems. Being a bonafied died in the wool ASE Master Tech, gas engines only, I've run into my fair share of "Oh hell it MUST be the computer" worries. I'll spend more time with the bus this weekend, AFTER the 'gathering' that Dallas and Cat are having.

Wayne

RTS/Daytona · February 19, 2010, 04:15:07 PM

If you have an AIR THROTTLE - then you will most always have a MUI (non-DDEC) D/D

IF you have a CHECK ENGINE LITE (CEL) you should have a DDEC - the CEL should blink a few times when the bus is first turned on
there should also be a momentary style bat switch up front to pull or down to blick out the DDEC error codes

here what a DDEC-II and DDEC-IV look like

RTS/Daytona · February 19, 2010, 04:47:26 PM

If you have an MUI (NON DDEC) DETROIT 6V92T

here another thing to check - if you hit the emergency shutdown switch by mistake - they have to be manually reset (i think - I'm a DDEC guy)

Just Dallas · February 19, 2010, 04:55:22 PM

Removed

wayneswirld2 · February 19, 2010, 07:11:34 PM

I've spoken to Mr. Bishop a couple times over the past two days, he's pointed me in some very RIGHT directions. AND with my almost negative amount of knowledge he's been very patient. I'll probably be calling him again, and damned soon, to ask very nicely for some more guidance. Either that or I'll burn the bus to the ground.....

Wayne

PCC · February 19, 2010, 10:18:54 PM

ASK - just ask

Ask has fewer letters than burn.

brando4905 · February 20, 2010, 06:14:01 AM

I'm not an expert on buses, but I did used to have a Dodge 2500 that was a veggie burner. If the PO was attempting to run a grease system with no extra filtering, no switches, and no heaters, then the entire fuel system could be restricted with hardened WVO.

luvrbus · February 20, 2010, 06:17:29 AM

Check you water level in the surge tank and fill it to the top

good luck

robertglines1 · February 20, 2010, 06:26:18 AM

2nd on surge tank...I know from experience...more often than not it's simple..

wayneswirld2 · February 20, 2010, 06:32:32 AM

To risk sounding like a complete dumb@ss....the surge tank is.........?

Wayne

RTS/Daytona · February 20, 2010, 06:37:06 AM

radiator water tank

MUST BE filled to the OVERFLOW PORT or SITE GLASS

wayneswirld2 · February 20, 2010, 06:41:01 AM

I sort of assumed that the surge was coolant related, but given that I'm in uncharted territory I'm not gonna assume ANYTHING....yet.

Thanks,
Wayne

RTS/Daytona · February 20, 2010, 06:57:19 AM

One of the first things that you may want to do is:

#1 - Make sure your batteries are charged - Make sure the oil and water and FUEL - is full !!!!!!

#2 - It's usually best to try start from the rear when your having a problem
check the switchwes in the engine compartment - usually there are 2

* ENGINE CONTROL (or something similar) - (NORMAL - OFF - REAR RUN)
set it to REAR RUN
(when you are all done - return this switch to NORMAL after you fix the problem - or you will not be able to run the bus from the front)
* START CONTROL (or something similar) - (NORMAL -OFF - REAR START
REAR START is a momentary switch - push to turn over the engine (there is often a few second delay) -
(when you are all done - return this switch to NORMAL after you fix the problem - or you will not be able to start the bus from the front)

#3 - If the engine turned over but didn't start - The next thing THAT I WOULD DO is:

Locate the secondary filter - they will usually have a 1/4 pipe plug between the inlet and outlet lines
- remove the plug and install at least a 0-60 PSI pressure gauge - worst case get a schrader valve adater to screw in and use a tire gauge

- With the engine turning over - you should get about 10-20 lbs of fuel pressure - if not re-PRIME from the primary filter

Pete RTS/Daytona