White smoke from fuel tank. Looks like blow by. Any thoughts - Diesel Forum - TheDieselStop.com
Power Strokes 1994-1997 General Technical discussion of topics related to vehicles powered by the Power Stroke engine in 1994 through 1997 models.

 
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post #1 of 6 (permalink) Old 07-16-2019, 08:48 AM Thread Starter
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White smoke from fuel tank. Looks like blow by. Any thoughts

Hey fellas, i have a 97 7.3 psd 1 ton with all the upgrades done. Injectors, efuel, turbo and intercooler etc. i have white smoke coming from the fuel tank cap and vent. Havent found much on the 7.3 psd. Anyone have any thoughts? Injector orings? Thanks in advance
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post #2 of 6 (permalink) Old 07-17-2019, 12:24 PM
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There shouldn't be smoke coming from the fuel tank cap. That would be something pretty strange and potentially serious.

Did you mean the oil fill cap on the engine?

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post #3 of 6 (permalink) Old 07-17-2019, 12:52 PM
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Maybe sucking air somewhere and pushing it back through the regulator into the return line.


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post #4 of 6 (permalink) Old 07-17-2019, 10:17 PM Thread Starter
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Nah man. Fuel tank. Ive had the bed off. Its a white smoke coming from filler neck and the roller over check valve. Not sure on the sucking air part. I noticed fuel pressure dropped from 60psi to 40 psi. Smoke or vapor what ever it is doesnt smell odd like blowby does. I dont know im stumped

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post #5 of 6 (permalink) Old 07-18-2019, 11:35 AM
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Is your exhaust leaking and heating the fuel tank. We had a old gas powered pickup with a steel tank and the exhaust was leaking and the gas in the steel tank would actually boil in the tank from the exhaust blowing on it.

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post #6 of 6 (permalink) Old 07-18-2019, 01:01 PM Thread Starter
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I was thinking that but It starts puffing smoke 30 seconds after start up.
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