inline fuel filter question

MSS3020 · Jun 23, 2016

so I had a inline filter "chrome" one on my tractor and replaced it with a plastic filtered one that you can
actually see the fuel.. question is how full is that filter suppose to be.. does it completely fill with no air
on the top or partially fill as long as pump intake hose is below fuel..

Elton Fancher · Jun 23, 2016

If you already have a sediment bowl, and working on a gas tractor, when you add that filter it will often create air pockets that will restrict or stop fuel flow. With the see through it will become obvious. If tractor stops running, throw it away.

JMOR · Jun 23, 2016

(quoted from post at 10:45:41 06/23/16) so I had a inline filter "chrome" one on my tractor and replaced it with a plastic filtered one that you can
actually see the fuel.. question is how full is that filter suppose to be.. does it completely fill with no air
on the top or partially fill as long as pump intake hose is below fuel..

uite normal/typical for those to have some air inside. Doesn't hurt flow. Still flows fuel just fine.

Mike M · Jun 23, 2016

On my lawn mower and truck with fuel pumps and those filters they barely ever show any signs of gas in them but run fine.

MSS3020 · Jun 23, 2016

nope.. nothing between pump and tank.. Its always had inline filter since I had it now 17 years.. but it was the chrome none see in kind..do to some running issues I put a clear one on.

dr sportster · Jun 23, 2016

I always wondered and noticed that on my motorcycles. I put two filters in parallel and they still had air but the resistance to flow would be cut in half . There seems to be no starvation to the engine with air in the filter.

JMOR · Jun 23, 2016

(quoted from post at 11:11:05 06/23/16) I always wondered and noticed that on my motorcycles. I put two filters in parallel and they still had air but the resistance to flow would be cut in half . There seems to be no starvation to the engine with air in the filter.

ep, it is a mistaken correlation & the incorrect junk just keeps on being repeated. Just like with propaganda, repeat it often enough & it becomes 'fact'……at least to many.

gene bender · Jun 23, 2016

Ity doesent cause a problem just make sure the filter is installed correct as it is marked which end goes to the carb. Those see thru ones just do their job and have worked well for many yrs.

gene bender · Jun 23, 2016

Yes use the plastic see thru ones those work fine but do not fill up but still will work fine till they get stopped up with fines then put a new one on and go.

Traditional Farmer · Jun 23, 2016

Some will fill up some look like they have hardly any gas in them but they all work well.On gas tractors I always put a filter before the carb and one between the tank and the
fuel pump if it has a fuel pump.Only time they are a problem is if they're stopped up with crud or they have had water go thru them either way they have done their job
and that's is to keep anything out of the carb.Those sediment bulb strainers will let things thru that'll stop up the jet hole or the needle valve hole in the carb.

MSS3020 · Jun 23, 2016

thanks to all.. that was my concern since never seeing inside the silver one.. was that the gas only comes up just past the top of hose to pump. I bought one that had a quarter inch and 3/8 inlet to which I cut off the 1/4 since my line is 3/8 just to make sure i didnt restrict.. I also have a screen on my inlet line inside the carb which can grab dirt also but not as fine as the inline i just got. I do like the idea of seeing what might come through this filter compared to other.. Thanks again...

jeffcat · Jun 23, 2016

As most everyone has said,, don't sweat the air bubbles. They will go away as the filter element starts to plug up. Had a little trash in a mower tank and it took like five or six filters till it all cleared up. They slowly plug up and they loose the air bubble.

Glen SW Wi · Jun 23, 2016

They work the same as the metal ones. Just don't get them too close to heat. My stepson had a VW van and used a plastic filter which melted. No more van or camping and fishing gear. Luckily no people hurt.

GordoSD · Jun 23, 2016

Agree. You have the sediment bowl and a fine screen filter in the carb. That rubber line and plastic filter is just a fire waiting to happen. Go back to the one piece steel line.

gene bender · Jun 23, 2016

They will collect fines that the sediment screen passes

jon f mn · Jun 23, 2016

Here is a pic of a larger version on my truck, they even have numbers to tell you how plugged it is. Lol

Geo-TH,In · Jun 23, 2016

I put an inline filter on Jubilee. It a
Was see through, had air bubble inside filter. When fuel temperature got around 150, It would vapor lock, totally full of vapor, no fuel would get to carb. Had to remove filter.

fixerupper · Jun 23, 2016

I put an inline filter on one of my tractors over twenty years ago. It flows fine and hasn't given a bit of trouble. The sediment bowl was somehow letting fines through no matter how perfect the screen was. I got tired of unplugging the idle jet in the carb so I cut the line and put in this inline filter. That ended the carb problems. The filter is way back away from the engine and is not subject to engine heat. Other tractors might not get along well with an inline filter, it's an individual situation. The rest of my gas tractors do just fine with a sediment bowl so I have left them alone.

gene bender · Jun 23, 2016

you dont mount them close to a heat source

Elton Fancher · Jun 23, 2016

Might work on some tractors, but I just took one off my 602 Moline, 336 cubiuc inch engine. Filter would not let it run, could not keep up. I had rust, put filter in last summer and fought it all year. Now is running With filter you had to let it run until it ran out, set a couple minutes and run some more. Not the first time I have had that happen, but yeah they will keep up a c farmall if you don't have too much to do. Just my experience. May make a difference in how much drop between tank and carb, maybe other factors, but they will not always work.

JMOR · Jun 23, 2016

(quoted from post at 15:48:20 06/23/16) Might work on some tractors, but I just took one off my 602 Moline, 336 cubiuc inch engine. Filter would not let it run, could not keep up. I had rust, put filter in last summer and fought it all year. Now is running With filter you had to let it run until it ran out, set a couple minutes and run some more. Not the first time I have had that happen, but yeah they will keep up a c farmall if you don't have too much to do. Just my experience. May make a difference in how much drop between tank and carb, maybe other factors, but they will not always work.

ad situation where flow essentially stopped. Removed filter & flow resumed. New filter & flow resumed, too. Dirty, clogged filters won't flow as well as does a new, clean filter. Amazing, huh?

Elton Fancher · Jun 23, 2016

Might be amazing, but since I put 2 new filters on and had same problem, and had fuel flow but not enough to run a tractor that will use 4 gallon an hour I decided to do something else. But whatever, I must just be stupid.

JMOR · Jun 23, 2016

(quoted from post at 16:43:24 06/23/16) Might be amazing, but since I put 2 new filters on and had same problem, and had fuel flow but not enough to run a tractor that will use 4 gallon an hour I decided to do something else. But whatever, I must just be stupid.

wouldn't say that! But might suggest a higher flow rate filter.

fixerupper · Jun 23, 2016

I checked the flow out of the one I have last Saturday while trying to figure out why the tractor wouldn't run right. It ended up being spark related. The filter flowed about a quart per minute straight out of the filter at about two inches below the tank. I can't say what the flow was at the carb though. The spin on filter on my 270 gallon gravity flow gas barrel wouldn't let gas out after the barrel was below half full if I was filling a tall tractor that was darned near as tall as the bottom of the barrel. the fuel level was still above the tractor by a foot or more but it wouldn't flow. I put an inline screen in place of the filter and that solved it.

Elton Fancher · Jun 23, 2016

Did not want to change sediment valve assembly, can only get so big of a line on it. I have found that a screen in the valve up in the tank catches lots of rust. But if the man has the filter in his hand all he has to do is try it, if it works for him it works. My Moline has the bottom of thank about level with or lower than carb and just would not run with filter. If you take the line off and let it down it would flow. I just got tired of that problem. It uses lots of fuel but I have a 301a Deere and a 2020 that are not sippers either. I have a 200 Allis that won't use nearly the diesel with bigger load and a 3930 Ford that will use a lot of diesel with a 7 ft. disc mower. I have a Super C and a 40 John Deere that don't use much because there is not jack for them to do.

JMOR · Jun 23, 2016

"My Moline has the bottom of thank about level with or lower than carb...". That is pretty much zero head or pressure!

Elton Fancher · Jun 23, 2016

Well, a downdraft carb does not require peessure, just adequate flow. If it goes out faster than it goes in you are going to run out. I do not really care for the John Deeres I have with the mechanical pump and tank level well below the carb. I have never had one with any wear that would start really fast, where as my Moline and most other A an B JD's and 2010 and most others with the free flow could be made to start in one round if not worn completely out.

gene bender · Jun 23, 2016

Your filter is dirty cause they will supply more than the engine can use. Thats what they are for collect small dirt and then get plugged so change and go with a new one.

Geo-TH,In · Jun 23, 2016

The heat source was the radiator blowing air on the gas tank. Old fords were famous for gas boiling in the tank. They even made a pusher fan blade.

I used an IR thermometer and when the fuel in tank go to around 145-150 I had vapor lock in filter. I even used a rubber gas hose and ran it around the steering column to keep it away from heat. No luck, vapor lock in summer.

Screen filters wouldn't vapor lock. geo.

ed will · Jun 23, 2016

Hi, I had a metal filter on my mower and replaced it with a plastic one. It shows the filter about 3/4 full, it's laying on it's side works well. Ed Will Oliver BC

Elton Fancher · Jun 23, 2016

Yeah, they pretty well never fill up/

Elton Fancher · Jun 23, 2016

They do not always supply more and for more than one reason. Too much drop or not enough will produce 'dams' in flow. Same reason sewer or septic tank lines have to have a gradual flow. Your friendly manufacturer had that worked out, as we change these things we can create additional problems.

rustred · Jun 23, 2016

well ... those inline filters should be on the pressure side of the fuel pump, just with gravity they will nver fill up.

inline fuel filter question

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