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6.2L Diesel - Tech Support - Troubleshooting - Performance 1982-93 6.2L Diesel - Welcome to the Internet's first discussion forum for the 6.2L engine.

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Old 07-25-2020, 02:51 PM
Taneleer Tivan Taneleer Tivan is offline
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Location: Germania, Arzgebirg
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Default FASS fuel system

Hi guys.
Is anyone running an electrical Fass or AirDog fuel seperator- System on its 6.2 n/a diesel?

Does anyone have any experience in this regard?

Does it make sense to Upgrade the fuel filter-& feed system?
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Old 07-26-2020, 05:09 AM
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Robyn Robyn is offline
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Welcome to TDP

I have never had any experience with the system you referred to.

Depending on the year of the vehicle there is certainly room for improvement.

Early GM 6.2 trucks had a mechanical fuel pump and a dual filter system.

This evolved in later years into a single rectangular filter/water separator on the firewall.

Then came the electric fuel pump (Lift pump) which was standard until the 6.2/6.5 was discontinued in 2000

An improved filter/water separator is always good.

5 psi delivery pressure MAX and 2 to 5 micron filtration is all that's needed....

I personally think that the air dog is overkill for these engines.....

A good RACOR FILTER IS ALL YOU NEED

I like the Racor 230R2 It has a spin on filter with a removable water globe on the bottom.

Also has a primer pump built in.

Far less expensive than the Dog.
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Old 07-27-2020, 03:15 PM
Taneleer Tivan Taneleer Tivan is offline
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Hello Robyn.

Thank you for your quick response and assessment.

The possibility with the cheaper single Racor filter is of course more space-& money saving and of course offers more options for installation in Combi nationalen with an electrical lift pump upgrade!


At AIRDOG, the air filter element makes me curious.
especially with such an underpowered naturally aspirated engine like the 6.2D, this could have a noticeable effect on performance.

Unfortunately, neither FASS nor PureFlow have no test bench values ‚Äč‚Äčthat show this in black and white! They all just show the filtered diesel fuel in their Test mount walls.

I think that it has a positive effect on starting and a smoother running of the engine
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