Because it clog them up. I Imagine its' a combination of things - Not carbon (that was smart) Foreign matter . I was curiouse too , when I backflushed the filter I got little black deposites and like a scaleing of some sort that resembled a plastic sandwitch bag . Don' believe in it -don't use the stuff ,I don't care.

 

It was a serious question whether or not you care. I have to get my filter and the front line replaced anyway since some yahoo jacked it up trying to replace the filter a while back. I still want to know WTF is in the tank that 1. scales and 2. is removed by a solvent at nominal temps.

 

I put a full container of seafoam in my '88 F-150 last summer atleast 4000 miles ago and I haven't plugged the fuel filter yet. The solvent in seafoam can't be that much better than that in fuel injector cleaner, and I have used that in the gas tank of many vehicles X many times, and have never plugged a fuel filter. The only way seafoam would plug the filter is if the vehicle had sat for a long time and the gas in the tank had started to turn to varnish and stuck to the sides of the tank.

 

the only way seafoam would clog the filter is if it actually worked, stop waisting your time and money

 

I can't speak for seafoam, because that's the first time I used seafoam and that was just a maintainence dose in place of a fuel injector cleaner. Fuel injector cleaner does work, it has solved many weird running problems for me. There are many pour in products that work and work well I might add. To quote my late uncle "I know from experience"

 

I think you guys been drinking the stuff lol

 

Actually what it really sounds like is that you guys are skeptical and haven't used it yet . That's most likely the case . I mean common , who's going to support a product that doesn't work . I know I wouldn't . I know it works - changing your filter can't hurt anyway . Spit all you want Seafoam speaks for itself , you guys are just way to jealouse for some stupid reason .

 

Another thing - If what yo guys are saying had any truth to it , why in the world would they even need a fuel filter. They put it there for a reason - Gee, I wonder what that could be?

 

say what u will, thats stuff has gotten me thru some emissins test i thoight id fail for sure.

 

I agree with brew I put seafoam in my tank and changed my filter did take a bunch of crap out of my tank or lines, came from some where and I have also sucked it down my vacume line and yes after letting it sit for about 15 min and starting it back up it idles smooth now if that ante results I dont know what is not saying that it is a permanent fix but it cleans the vacume ports and the sencers besides if it didnt work it didnt hurt.

 

What i need to know did clog your fitler i did put it in the tank i just dont want to chang it now but i dont want to be on the road and it quit on me it is a 99 F150 5.4 4x4 off road

 

It didn't Clog it on mine , but it did another person on theis site - I new better when I did and changed it - Take your chances - just a 10 minut job.

 

For you 10 me 60 and it is cold hear

 

I'm in Michigan lol , But yeah , I use a heated pull barn when I need to work on her. Lucky I guess . I've had to bust my knuckles in the cold many times tho. It sucks . Usually your filter when it start to plug up it will give youwarning by running crappy. I haven't had one leave me stranded yet.

 

I have used Seafoam and it seemed to help some. But, I really think the stuff you guys are backflushing out of your fuel filters is the crap that the filter is supposed to catch, that would be the junk in the gas from the gas stations.