FASS Fuel Filter Delete Install: Duramax LML

[@Blue_Collar_Hunter]

So with this delete. I need to run a Fass or Aid Dog lift pump? New to diesels, trying to learn the ins and outs.

[@Aaronelliott847]

Scott Allen yes get a Fass

[@rickguerra8730]

What are the pros and cons of deleting fuel filter under the hood Especially with a CP4 still in place Thank you in advance

[@markthomas4083]

@@rickguerra8730 still waiting after two years.

[@rogerm6069]

What would happen if you just left the check ball housing piece off to would it hurt anything

[@Blue_Collar_Hunter]

I got this delete and a Fass lift pump, no regrets. Solid product.

[@chrisao1987]

This is a good way of doing it this way if the pump shits out on you. You can disconnect the fuel lines put it back to stock and add a filter back with the ball valve and keep rolling. I don’t like the ideas of pulling the primer out all together.

[@thomasvizcainco5658]

So how does your fuel get filtered?? Did I miss something

[@thoroughbreddiesel]

This product is if you have a fuel pump kit that already has a filtration system, so that you aren’t doubling up on filters.

[@camco15]

Is this the same as the 2015 GMC Sierra

[@marksmann82]

Why put the check ball housing back in place? It seems it wouldn’t do anything even if removed all together.

[@thoroughbreddiesel]

The inlet of the fuel filter seals there.

[@marksmann82]

But there would be no fuel filter. So it wouldn’t need to be re-installed correct?

[@kenm9682]

Pull the two 13 mm bolts from the top of the housing . Two fuel line clamps and do it on the bench

[@dy-no-mite9365]

What do you mean?

[@Blue_Collar_Hunter]

@@dy-no-mite9365 he is stating to remove the filter & housing to work on out of the truck. It's actually pretty fast to work on with it in place took me about 30 minutes for everything start to finish including clean up.

[@johnlove5310]

Which spot is better there or lift pump for the fuel pressure gauge? Or does it not matter?

[@stevenbader636]

Can you leave the check ball installed or do you have to remove it?

[@thoroughbreddiesel]

Check ball MUST be removed.

[@myrkobalaban8571]

1: What is the tool that you used to screw the filter sensor onto the filter delete housing?? 2: Where can I find one??

[@thoroughbreddiesel]

We have the WIF Sensor wrench located here: www.thoroughbreddiesel.com/513080000/

[@slabaugheli]

What is the reason for removing the the ball check valve located inside the stock fuel filter holder? I need help asap to hopefully get my problem fixed with no getting fuel to engine.

[@thoroughbreddiesel]

Removed because the fuel filter delete does not engage the ball to allow fuel flow. If you are using this type of filter delete, the check ball must be removed.

[@michaelsacy5849]

Can you remove the check ball even if you have a cat filter adaptor there with a fass

[@juanvasquez8446]

@@michaelsacy5849 I wanna know the same thing?

[@dy-no-mite9365]

Can someone tell me if my water in fuel sensor on my truck attaches to the FASS Fuel bowl or do I have to order the Water in sensor sensor with the kit? Thanks in Advance

[@wayawolf1967]

Why delete? Just remove and bypass it. I did two years ago. The fass system takes care of my filtration just fine.

[@camco15]

After a year mine came loose and was spilling diesel out so I tighten it really good I don't know if that's bad or not but is that normal for them to come loose

[@thoroughbreddiesel]

Haven't heard of that. Always good to re check tightness on something aluminum after installation.

[@Offroadbro69]

I deleted my 2016 lml and tuned with ppei. I have the fass fuel pump and stock filter delete. I can’t get the service fuel filter light to stay off. Any help?

[@thoroughbreddiesel]

If you haven’t changed fuel filters on the FASS lately, suspect that first. If not and you are confident of the supply pressure, I would suggest checking the fuel pressure sesnors, low side, close to the fuel filter housing.

[@Offroadbro69]

Thoroughbred Diesel ya I have replaced the filters 3 times now and I just deal with the light because I try and reset it but it’ll just come right back on. So maybe it’s a sensor, are you referring to the sensor on the bottom of the fuel filter delete?

[@esbwn]

My 2002 LB7 has a CAT filter where the factory filter is, I just had the FASS pump/filter put on it. Can I put this where CAT filter is now? I dont have the water sensor on the bottom of the CAT, Im assuming the previous owner had to remove it to be able to use the CAT filters. What would you recommend I use there?

[@victorrader4349]

or just leave the CAT-1 filter for secondary filtration which can't hurt to have super clean fuel. That filter is I think 2 microns. I'm getting ready to add the FASS and that's what I'm planning to do, even though it is a pain to replace, but as a secondary filter I'm thinking once a year.

[@Blue_Collar_Hunter]

@@victorrader4349 why would you want to run 2 fuel filters? Wouldn't your Cp3 have to work twice as hard?

[@victorrader4349]

@@Blue_Collar_Hunter not at all with the additional FASS fuel pump. I think the only reason to delete the stock filter is because you have added a fuel pump and filter (in the back). Mechanics and other research on my part says the best way to protect your injectors is with clean fuel and a double system is the best way to do that, in fact with the FASS in the back the best option would be to replace the stock with the CAT 2micron filter up front, unless you're worried about leakage from the adapter, otherwise 2 stacked 5microns can't hurt imo.

[@charliehollis5614]

Just asking but why delete the filter I have a Lml 2011

[@thoroughbreddiesel]

If you have an aftermarket lift pump with filters, it cleans up your engine bay and keeps you from having to replace another filter.

[@TheDisciple556]

How dose the filter delete handle cold weather?

[@vladleonard86]

Is this a good idea to delete the fuel filter if i run on sunflower oil?

[@thoroughbreddiesel]

I really can’t advise you on that as I am not knowledgeable in sunflower oil. Removing the filter is decreasing the filtration, this is usually coupled with pumps that we offer that have increased filtration.

[@JavierPadron]

Is it bad to keep the factory filter?

[@jacobpowers8958]

I would bypass if you have a lift pump! Just remove the whole unit and replace with a piece of hose and 2 hose clamps.

[@glyshorts9107]

@@jacobpowers8958 is it hard to prime it back up again with the priming option no longer there?

[@glyshorts9107]

@Jake Powers if remove the whole unit there wont be a filter to unscrew. So just leave hose disconnected and push fuel thru it? Then hook hose up? Guessing here.

[@saltysteel3996]

@@glyshorts9107 You could remove the black plastic cap from the fuel vacuum test port behind the alternator and depress the Schrader valve down to let air escape until diesel fuel starts coming out while the lift pump is running. When fuel starts spraying out just release the Schrader valve to close it, reinstall plastic cap.

[@badchristiansen]

will this delete trip any type of codes on an LMM???

[@thoroughbreddiesel]

The fuel filter delete will not cause codes.

[@dirty3000]

Not sure why you wouldn’t just leave it to have a dual filtration

[@chrisao1987]

Duramaxdenali the Fass or Airdog systems filters are 2 micron the stock is 6 so the stock filter isn’t going to filter out anything the lift pump filter didn’t get so all it’s doing is causing unnecessary restriction on your lift pump and CP3. Trust me I was you I had the same question till I talked to a local diesel shop that explained it to me.

[@Blue_Collar_Hunter]

@@chrisao1987 that makes alot of sense. No need for the added headache of double filtration.

[@glyshorts9107]

@@chrisao1987 so is it best to delete the whole assembly? If so, how do you prime air out of the system if you delete the original filter head? Thanks .

[@stevenllewellyn8906]

@@glyshorts9107 it’s a 50gph stock filter. I left Mine intact with my fass lift pump and full delete. With the CP4 I want more filtration. It’s not hurting it and if you ever get a batch of bad fuel or water in it that’s made it PAST the Fass or air dog filters ( which has happened to people ) you’d want the extra filtration...

[@aaronweathers9462]

Any benefits to this besides not having to change the filter under the hood? I've got an Airdog on my 2012 LML just trying to see if there is any gain to doing this delete?

[@1nickadair]

cheaper ( no filter to replace) is one, if you chip your duramax too far the injection pump will pull a vacuum after this filter and your truck will say your filter is bad, and if enough of a vacuum your truck can go into limp. mine did this twice when pulling a trailer. trucks swt up for 650 to 700 hp at the wheels which requires a lot of fuel. Went up a steep hill and was on the throttle for about 2 minutes and truck went limp. checked the code and history and i wanna say my pressures were about 9500 psi instead of the 14000 I think it's supposed to be. numbers could be wrong I just remember it was way low. FASS will supply enough fuel, but the filter will only let so much through no matter what.

[@R0gu3Ju5t1c3]

So you're saying not to throw it into the hotter tunes with a filter delete? I rad mine for about a week in the second highest tune and had no issues at all. As soon as I bumped up to the race tune I got a "change fuel filter" signal. Truck still runs great just wondering what the issue is

[@billroach2393]

I think Nicholas Adair is trying to say that if you're running the hottest tunes you SHOULD delete the stock filter (like they've done in this video) because the stock filter is too restrictive and the CP4 will not be getting enough fuel when you get on the gas big time!! When you bumped it into RACE tune, the filter was too restrictive..... If you want to run RACE tune, do the filter delete (as long as you've already got a FASS or AirDog etc

[@michaelsacy5849]

Will this work with lb7

[@thoroughbreddiesel]

Yes, this fits up to current model years.

[@Mebob2001]

what fuel filter do you recommend? i know i usally tell people to run the ac delco one, simply because i've seen cat filters come apart, baldwin, ect... yet to see an a/c delco come apart, doesnt mean they don't just never seen it, but yet again whats your views?

[@thoroughbreddiesel]

We have not seen any filters “come apart” during normal operation. A lot of times people will associate a filter failure with something that is wrong with the filters, when many times it is lack of service or contaminated fuel.