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Old 10-12-2021, 05:30 PM   #1
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Fuel Filter Prime?

Anyone ever prime they're fuel filters with seafoam or kerosene? I primed them with regular diesel the other day but I don't like carrying that stinky stuff around for filter replacement on the road. So I'm wondering about a "nicer" alternative.
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Old 10-12-2021, 05:38 PM   #2
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WAIT.


We have on idea what engine you have.


Some engines prime up with as little as cycling the key a couple of times. Certainly applied to our 2003 Cummins ISL.


Please tell us what engine and year you have and we can give better advice.
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Old 10-12-2021, 05:42 PM   #3
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Originally Posted by wolfe10 View Post
wait.


We have on idea what engine you have.


Some engines prime up with as little as cycling the key a couple of times. Certainly applied to our 2003 cummins isl.


Please tell us what engine and year you have and we can give better advice.
400 isl
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Old 10-12-2021, 05:44 PM   #4
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Originally Posted by wolfe10 View Post
WAIT.


We have on idea what engine you have.


Some engines prime up with as little as cycling the key a couple of times. Certainly applied to our 2003 Cummins ISL.


Please tell us what engine and year you have and we can give better advice.
2003 Cummins 400 ISL, Your saying I could leave them empty and not be concerned about trashing the lift pump?
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Old 10-12-2021, 05:44 PM   #5
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I Keays fill the fuel filters with diesel and still cycle the ignition switch.. I use diesel fuel.
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Old 10-12-2021, 05:45 PM   #6
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Install filter(s) dry and cycle the key from off to on (not start).


Listen to the fuel pump which runs for about 30 seconds each time you turn the key from off to the first position. When it's RPM goes from high (pumping air) to normal speed (pumping fuel) you are primed. Just start it up.
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Old 10-12-2021, 06:01 PM   #7
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Install filter(s) dry and cycle the key from off to on (not start).


Listen to the fuel pump which runs for about 30 seconds each time you turn the key from off to the first position. When it's RPM goes from high (pumping air) to normal speed (pumping fuel) you are primed. Just start it up.
Plum scary... where's the lift pump at?
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Old 10-12-2021, 06:41 PM   #8
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You do not prime isl filters. Use the lift pump. The accumulator will fill just fine.
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Old 10-12-2021, 07:36 PM   #9
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You do not prime isl filters. Use the lift pump. The accumulator will fill just fine.
It wont hurt it to prime it will it?
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Old 10-12-2021, 07:52 PM   #10
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If you prime it, just use diesel, really no different than kerosene or jet fuel.
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Old 10-13-2021, 11:24 AM   #11
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I prefer to prime the primary fuel filter with fuel, this is the first filter inline of the two filters.

Here’s how it’s always worked for me.

Take out both filters. Our ISL has two inline fuel filters.
Install the new secondary filter, or second filter inline in. This filter filters at a lower micron level.
Then take the old secondary filter and fill the primary filter with the diesel from the secondary filter. Since the secondary filter filters out at a lower micron rating and the new primary filter has a center plug this will force the fuel to get filtered again.
Install the primary filter and you’ll only have to cycle the key maybe twice and the engine will start… Of course if you only have one fuel filter this method will not work.

Hope this makes sense…..Works for me….YMMV….
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Old 10-13-2021, 11:29 AM   #12
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The first time I changed filters I didn’t fill them first . Had a real problem starting the engine wound up pressurizing the fuel tank to get it started. Be sure you turn off the fuel shut off valve located at the first filter on my coach . when you remove the filters if the valve isn’t shut off the fuel can drain back into the tank! This will really create a problem having no fuel in the lines.
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Old 10-13-2021, 02:36 PM   #13
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Quote:
Originally Posted by BigNick1 View Post
Anyone ever prime they're fuel filters with seafoam or kerosene? I primed them with regular diesel the other day but I don't like carrying that stinky stuff around for filter replacement on the road. So I'm wondering about a "nicer" alternative.
CAT says "do not prefill" ... but many still do.

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Old 10-13-2021, 03:40 PM   #14
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It wont hurt it to prime it will it?
You are chancing introducing dirt directly into your 3500$ for a rebuilt + labor caps pump. Why do you think letting the lift pump fill them is not proper? That is what it is designed to do. Then no chance of unfiltered fuel in your high pressure injection pump.
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