7.3 fuel problem, maybe?
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Senior User
Joined: Jun 2003
Posts: 114
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From: South-East Tx.
7.3 fuel problem, maybe?
Ok dumby here, I got a 1999 7.3, has about 200,000, ran great till three days ago. Went to move the truck and turned key on and waited for WTS light to go off, started engine as usual, let run for a little while, and put in Dr. the truck started moving then engine started to lope, pushed down on skinny pedal and it kept lopeing then died Turned key on again waited for light to go off, and it started and loped again and died. Engine is full of oil HPOP oil is close to one inch to the top, changed Cam sensor, already had one, still will not start. When I try to start it, it sounds like a gas V8 with some plug wires off and sorta has a knocking sound. Fuel filter is full, unpluged ICP, still no start, but has a little white smoke when it does fire.
Lead Driver
Joined: Jun 2004
Posts: 6,362
Likes: 593
From: Amarillo, TEXAS!
How cold is it there? It sounds like bad glow plugs. Have you tried plugging in the engine block heater for a few hours and seeing if it will start after doing that?
EDIT: After re-reading your post I see it ran for a while, so may not be glow plugs, but still can't hurt to check the GPR and GPs.
EDIT: After re-reading your post I see it ran for a while, so may not be glow plugs, but still can't hurt to check the GPR and GPs.
Fleet Mechanic
Joined: Dec 2010
Posts: 1,546
Likes: 9
From: Wellington, Co
I know the other morning when mine had gelled fuel, it ran, but very bad. It does sound like you have a fuel pressure problem, for what ever reason. Try the red bottle Diesel Kleen, 911. Should take care of a gel issue.
Fleet Mechanic
Joined: Dec 2010
Posts: 1,546
Likes: 9
From: Wellington, Co
Wed morning it was -13 when it acted up. Had it plugged in overnight, also saw the problem on my fuel pressure gauge. People say keep the white bottle DK, or equivalent in the tank. I am a believer.
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Hotshot
Joined: Dec 2006
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From: Melbourne, Ky
I believe that untreated diesel can get cloudy around 35 degrees. Every place up here mix it with kerosene. I think I'm safe down to single digits. If it gets colder than that, I add some diesel fuel treatment to it. I've been told that places down south don't mix kerosene. I guess it's more expensive. I know the truckstops up here get calls when it gets cold and trucks from the south head this way.
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Fleet Mechanic
Joined: Dec 2010
Posts: 1,546
Likes: 9
From: Wellington, Co
I believe that untreated diesel can get cloudy around 35 degrees. Every place up here mix it with kerosene. I think I'm safe down to single digits. If it gets colder than that, I add some diesel fuel treatment to it. I've been told that places down south don't mix kerosene. I guess it's more expensive. I know the truckstops up here get calls when it gets cold and trucks from the south head this way.
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Senior User
Joined: Jun 2003
Posts: 114
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From: South-East Tx.
I am sorry I didn't say it was plugged in, in the shop, temp not a factor, I shouldn't have , but I sprayed a little starting fluid and it ran for about 5 seconds. then died. Oh the temp was in the 40s.
