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Cold weather diesel issues
I have a Chevy Silverado 2500HD Duramax that is running like crap below 35 degrees
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If your dealer has found bacteria in the filter, you indeed are running on some poor quality fuel. More than likely, it's been in the holding tank too long. A clean filter, some trusted fuel (find a nearby truck stop), and some cleaning additive will get your fuel system back up to snuff. And depending on where you live, if 32° is rare, then most likely you are seeing some gelling as the fuel for your area is likely not "winterized" as it is in the northern states.
Power Service products are highly thought of in the trucking industry, and are sold in bottles small enough for consumer use.
kcram - Pickups Host
The water separator should be checked and drained periodically to make sure that water won't make it into the fuel injectors. This is also a good check of your fuel supplier (gas/diesel station). If you see you are draining a lot of water regularly, the fuel you are buying has too much water in the holding tank and you should look for a new fuel source. A drop or three of water is not a big deal when draining the separator, but that's all.
kcram - Pickups Host
- under +40°F, plugging in is suggested
- under +10°F, plugging in is required or strongly encouraged
- under -10°F, mandatory
The separator is located specific to each vehicle. You'll need to get a service manual for your truck for the location and operation.
kcram - Pickups Host
kcram - Pickups Host