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Join Date: Sep 2017
Posts: 1

Fuel Bowl Full No Pressure at Shroeder Valve t444e No Start

09/11/2017 9:08 PM

1998 t444e in 4700 truck. engine was running great. but truck not in use due to insurance matters. would start in once, twice a week to keep battery charged. started it up while raining one day. found wipers did not work. no power to motor. fuse, relay good. took the fuse box down, and discovered numerous wires were missing part of their insulation or holes poked in them and never covered up.

I thought it best no to mess around back there (behind the fuse box) and run another circuit and switch for the wipers and cover all the exposed wiring very carefully. as I was doing this It was quite a few wires. I would periodically reconnect the battery and start the engine just to make sure I have not effected another circuit. it would start every time. after I got finished and bolted the fuse panel back I turned the key an got nothing no crank at all. but for some reason it would sometimes crank but no start but then soon as I turn the key off and tried again no crank at all . I narrowed that problem down to the tall yellow 2 second time delay crank relay. so I thought the relay was OL when omh reading was taken. so I changed it. before putting in the new one I checked it and it had continuity. put it in it didn.t fix the problem. Checked the new relay again for continuity and there was none. But when I jumpered the start terminal to the load terminal of the crank relay pug in with a fusesable link the starter cranks the engine every time I also chanced the ignition switch for good measures

Now I have a crank no start problem. My fuel filter bowl is full of fuel. I have no fuel pressure at the shreoder valve next to the bowl. I removed the icp plug it had some oil on the connector I heard that's not a good sign. I tried to crank it with the plug out to see if will go into default and start. that didn't work. I pulled the icp sensor and cranked it then to see if the oil pump was working ok and a lot of oil shot out when cranking. can it be the ipr or could I have fouled up something electrically that is affecting my fuel system. Engine was starting and running fine until I started covering exposed wire and running a new wiper circuit. what could I check next?

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#1

Re: fuel bowl full no pressure at shroeder valve t444e no start

09/11/2017 9:28 PM

You need three things fuel, air and fire.

If you think it's fuel starved, dump a little gas in the carb and try it.

If that doesn't help, check to be sure the plugs fire.

Your wiring problems are far too complex for anyone to help you long distance.

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Guru

Join Date: Mar 2007
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#2

Re: fuel bowl full no pressure at shroeder valve t444e no start

09/11/2017 9:35 PM

The truck is 20 years old and you're asking what could be wrong?? How about anything...anything could be wrong....Trade it for another newer model, or be prepared to restore the vehicle....trying to keep this truck running by changing one part at a time will be a constant battle and a major source of frustration...

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United Kingdom - Member - Indeterminate Engineering Fields - Control Engineering - New Member

Join Date: Jan 2007
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#3

Re: fuel bowl full no pressure at shroeder valve t444e no start

09/12/2017 3:19 AM

<...what...check next?...> How about the prospects for relocating and recycling the vehicle?

https://www.youtube.com/watch?v=tPDLX0koXFs

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Join Date: Jul 2017
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#4

Re: fuel bowl full no pressure at shroeder valve t444e no start

09/12/2017 3:46 AM

Without knowing the engine concerned but going on experience, you state the fuel bowl is full but you have no pressure at the Schrader Valve.

The Navistar motor does not have a hi-pressure fuel system like conventional diesels, it uses a Bosch Heui pump. See details here

http://www.trucktrend.com/how-to/expert-advice/1304dp-heui-how-high-pressure-oil-injection-systems-work.

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Guru

Join Date: Mar 2011
Location: Lubbock, Texas
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#8
In reply to #4

Re: fuel bowl full no pressure at shroeder valve t444e no start

09/12/2017 2:06 PM

the only Schrader valves on my truck are keeping the air in the tires. If you have fuel in the tires, RUN!!!

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Anonymous Poster #1
#5

Re: fuel bowl full no pressure at shroeder valve t444e no start

09/12/2017 8:07 AM

Are you sure it isn't a Chevy Cavalier?

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#6

Re: fuel bowl full no pressure at shroeder valve t444e no start

09/12/2017 9:48 AM

Since when did Chevy start fitting Navistar diesel engines to a Cavalier?

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#7
In reply to #6

Re: fuel bowl full no pressure at shroeder valve t444e no start

09/12/2017 10:57 AM

Oh it's been done....

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#9

Re: fuel bowl full no pressure at shroeder valve t444e no start

09/12/2017 2:20 PM

1,7 liter Izuzu diesel is not quite the same as a 7,3 liter Power Stroke diesel!

It would be like taking my Jeep 5,7 liter Hemi and putting it in a 1,6 l Honda Civic !!

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#10
In reply to #9

Re: fuel bowl full no pressure at shroeder valve t444e no start

09/12/2017 3:48 PM

Are you wanting the thing to do cartwheels?

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#11

Re: fuel bowl full no pressure at shroeder valve t444e no start

09/12/2017 6:02 PM
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#12

Re: fuel bowl full no pressure at shroeder valve t444e no start

09/13/2017 2:54 AM

Old person's grumble: Electronic controls? Stick it. A set of feeler gauges and a screwdriver was all we needed in my day.

Ok, you have a diesel engine with an ECU. You may or may not have fuel pressure, I'm not sure but T444e is a mechanical fuel pump anyway? Check the ECU is actually connected, confirm you haven't done anything to fry it. Confirm you haven't done anything to disconnect any of the sensors. I guess you've checked the diagnosis codes?

After that I'd go to the specialist forums & youtube where there is quite a bit on T444e standard problems and solutions.

Lovely engine though. Lots of Kw....

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Anonymous Poster (1); evanmjones (1); James Stewart (2); lyn (2); PWSlack (1); SolarEagle (2); The Wizard (3)

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