Possible Bad Fuel? - PowerStrokeNation : Ford Powerstroke Diesel Forum
 
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post #1 of 7 (permalink) Old 10-07-2018, 12:10 AM Thread Starter
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Possible Bad Fuel?

I have a 97 7.3 that I think may have gotten bad fuel. Let me start by saying this: the water in fuel light never really came on until about 7 months ago when it would just randomly come on. I would drain the bowl and then the light would shut off. Sometimes it would come on while I was going around a bend and sometimes it’ll turn on and the truck will run fine; shut it off and drain the bowl, start it back up and it still runs fine but the light would be on still. The truck has always ran well though.

This morning I went to get fuel because my tank was a little low (I only use my front tank because my rear tank leaks.), I get fuel and drive to a few stores and everything is fine. Then I pull up to a stop sign and the idle drops and it runs really rough and has no power. I tried getting it home and it had no power and then would randomly surge and have normal power for a second but then go back to rough idle.

I got it home and drained the fuel bowl into a jar and let that sit next to me. I start the truck back up and it runs ok for literally 2 seconds and then runs rough again. I left it running and went to the parts store in another vehicle. I came home, shut the truck off, pumped out all of the fuel from the front tank, then pumped in 10 gallons from my roomate’s truck (she got fuel somewhere else and her truck ran fine). I also put a new fuel filter in and added some of the diesel help water remover. The truck started and ran rough, it would have times when it would idle a little better than others and at some point it wasn’t that far off from a normal idle. Overall, it still ran rough for about 15 minutes. Then the truck died(it had not done that at all until now). I drained the fuel bowl and it started and ran rough and then died about 30 seconds later.

In the past year I have replaced: the IPR, the injectors, the HPOP, the IDM and a few other parts. I plugged my Bluetooth adapter in and it has no codes. While running rough it shows me an IPR duty cycle of about 18.7 and normal it’s about 14.7 and the HPOP started at around 770 and jumped between that and 1300 but overall it stayed between 770 and 990. The water in fuel light is still on. When the truck dies I drain the bowl and put fresh fuel in and the light still stays on. Then the truck barely starts and runs rough and dies after a few seconds. If you try starting the truck back up right after it will barely start once and then it just won’t start if you try again right away. I left the truck sitting for about 2 hours and came back out and it started and did the same thing.
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post #2 of 7 (permalink) Old 10-07-2018, 01:00 AM
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Re: Possible Bad Fuel?

after sitting a while, what did the fuel you drained out look like?
was there water in the bottom, or was it pure fuel?
i have seen the Water in fuel sensor short out more times than i have seen water in the fuel on trucks.

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post #3 of 7 (permalink) Old 10-07-2018, 01:18 AM Thread Starter
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Re: Possible Bad Fuel?

After letting it sit for a while, there seems to be dark red/light brown little spots covering almost the entire bottom of the jar. The fuel in the jar is from originally draining the bowl. Should I fill another jar now?
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post #4 of 7 (permalink) Old 10-07-2018, 01:28 AM
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Re: Possible Bad Fuel?

If there was enough water to cause problems it would be layered in the bottom and not just little spots.

If you want to see what water in fuel actually looks like get some fuel into your jar and then put enough water into it to come up off of the bottom of the jar. The fuel will be on top and the water on the bottom.

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post #5 of 7 (permalink) Old 10-07-2018, 03:56 PM
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Re: Possible Bad Fuel?

Did you ever change the fuel filter? I had this happen with a 95 7.3 and three tractors with a slip tank of bad diesel fuel. Change the filter, put in some good fuel and give it a shot. Was a night and day difference for me.

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post #6 of 7 (permalink) Old 10-08-2018, 05:13 AM Thread Starter
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Re: Possible Bad Fuel?

The old filter was black but I think I changed it around 5k ago. I put a new filter in after I pumped out all of the old fuel and the filter is still normal color. I pumped all the fuel out of the tank and then put in 10 gallons of fresh fuel. I'll post a pic of the old filter tomorrow as well as the IPR and CPS readings. I put a fuel additive in after I pumped out the tank that is supposed to remove water and I let it sit over night. This morning I went to go start the truck and it started up and ran perfectly for about 10 seconds and then started sputtering and running rough again so I shut it off. Could the screen inside the fuel tank be clogged?
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post #7 of 7 (permalink) Old 10-10-2018, 01:38 AM
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Re: Possible Bad Fuel?

Quote:
Originally Posted by Melamed555 View Post
The old filter was black but I think I changed it around 5k ago. I put a new filter in after I pumped out all of the old fuel and the filter is still normal color. I pumped all the fuel out of the tank and then put in 10 gallons of fresh fuel. I'll post a pic of the old filter tomorrow as well as the IPR and CPS readings. I put a fuel additive in after I pumped out the tank that is supposed to remove water and I let it sit over night. This morning I went to go start the truck and it started up and ran perfectly for about 10 seconds and then started sputtering and running rough again so I shut it off. Could the screen inside the fuel tank be clogged?


I’d recommend removing the fuel filter and doing a visual inspection of the bottom of the fuel bowl for water . Also if the fuel filter is black I’d suspect possibly a injector O ring leaking engine oil into the fuel system . Is there diesel in the crank case ?
Your ICP seems a little high to me ...


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