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Inline Fuel filter

B

bsmart10

Member
I installed a translucent in-line fuel filter in fuel supply of the Farmall H for my friend. Same tractor that had what we thought was a slow fuel supply, not allowing the tractor to keep running. The new inline filter was installed b/c the screen in the inlet pipe to the carb was damaged and no longer useable.
So, we noticed that the new filter does not get full of fuel. It levels off at about the outlet pipe/line position in the filter. I would have thought that when the float in the carb shut off flow, the inlet fuel line would fill up all the way back to the sediment bowl. Nope, apparently not. Why not?
We can see the fuel flowing into the filter (which is a good improvement) when the engine is running, but still the level in the filter never gets above the outlet line.
We do have adequate flow now to keep the tractor running, so we drove it up the road to see if it would accept loads, and it did just fine. All seems to be working now, even with the filter never really filling up with fuel....any ideas about this?
 
Common problem with an in line filter and gravity flow system. Unless you really have an in line filter made for a gravity flow system it will sooner or later come back and get you. I have thrown at least 30 of them away due to them causing problems. The correct sediment bowl is all you need or as was posted yesterday they make a filter for the sediment bowl
 
Most don't stay full of fuel won't affect the running of the tractor as you found out.I have at least 10 gasoline tractors with in line filters that run with no problem and don't get crud in the carb because of them.Any tractor gas or diesel filter or not will be better off long term if you keep the fuel tank at least 3/4 full and be extremely careful about keeping the fuel uncontaminated.
 
(quoted from post at 18:47:35 06/12/21) ..... I would have thought that when the float in the carb shut off flow, the inlet fuel line would fill up all the way back to the sediment bowl. Nope, apparently not. Why not
Click to expand...

When the needle valve seats in the carburetor, it blocks the flow of fuel AND air. Without this flow ALL stops. Same happens in sediment bowls after emptying the bowl for cleaning. If carb is full of fuel, no flow till fuel is used or sediment bowl is loosened allowing air to escape.
 
well the fuel is not going to flow if the needle shuts the gas off, and the filter will never be full. any tractor i have seen with those
goofy filters.. they are only about half full. they had a fine screen at the sediment bowl and one at carb inlet and thats all that was ever
on them. those inline filter are for a fuel pump where the fuel is pushed through them., then they are full.
 
Inline filter generally only fill about half full. Even the filter on my lawn mower with a pump is only half full.

I have an inline filter on nearly all my gas tractors. Never had a problem with any of them. I buy the better metal filters from NAPA or CarQuest. Not the cheap
plastic ones.

I'm a member of several tractor groups on Face Book. This topic comes up about once a week. I find it funny. If you don't convert to 12 volts your dumb. If you
don't convert to EI your stupid. If you put a modern fuel filter on an antique tractor. Your both dumb and stupid. They do not like it. They are sure your tractor
will burst into flames because inline filters cause fires. Another internet old wives tale.
 
hummm, guess u changed ur mind , couple years ago u swearing that the inline was the way to go. or u took my advise .lol. i even remember getting in argument cause u said they were so good. live and learn.
 
You better double check that bull your putting it on thick. I have NEVER said to use them plus why don't you leave me alone or are you such a bully you can't stop being a bully
 
(quoted from post at 17:47:35 06/12/21) I installed a translucent in-line fuel filter in fuel supply of the Farmall H for my friend. Same tractor that had what we thought was a slow fuel supply, not allowing the tractor to keep running. The new inline filter was installed b/c the screen in the inlet pipe to the carb was damaged and no longer useable.
So, we noticed that the new filter does not get full of fuel. It levels off at about the outlet pipe/line position in the filter. I would have thought that when the float in the carb shut off flow, the inlet fuel line would fill up all the way back to the sediment bowl. Nope, apparently not. Why not?
We can see the fuel flowing into the filter (which is a good improvement) when the engine is running, but still the level in the filter never gets above the outlet line.
We do have adequate flow now to keep the tractor running, so we drove it up the road to see if it would accept loads, and it did just fine. All seems to be working now, even with the filter never really filling up with fuel....any ideas about this?
Click to expand...
The filter will work until it stops up, restricted with what it filters.
If you want the air bubble gone, tilt the filter so the bubble can go uphill towards the fuel tank. Gravity will fill the void with fuel and push the air up. If your fuel line has up and down turns, the bubble will travel up but not back down, with slow gravity flow.
A fuel pump would push the bubble up or down, given adequate flow rate.

This post was edited by racered57 on 06/12/2021 at 06:12 pm.
 
right, just like the 20-50 oil... once i started talking about it then all of a sudden you were using it in everything.
 
(quoted from post at 21:20:37 06/12/21) BECAUSE THAT IS JUST THE WAY THEY WORK I HAVE BEEN USING THEM FOR 20YRS DO
NOT WORRY THEY WORK
Click to expand...
bsolutely! Even on ATV where the graVity feed height is nearly nothing. Done it since `2000 AND STILL WORKING FINE HERE IN 2021.
9qV6IOH.jpg
 
on them. those inline filter are for a fuel pump where the fuel is pushed through them., then they are full.[/quote]

I was wondering about this recently when I bought an inline filter for a riding mower. The parts man asked if it had a fuel pump. No, it's gravity feed. He pulled out a little red filter about the diameter of a half dollar. I told him mine was clear with a paper element you could see. He said he had better luck with these little red filters. Ok. Now I'm wondering if that little filter would work on a farm tractor--not that I plan to try.

Gerrit
 
I have that type on my jeep and the majority of the time that is the way they work for me too. If it's driven for a long time it will finally fill up but the next day the fuel level drops. Your solid filter probably did the same thing but you couldn't see it.
 
here is a new style of filter for small engines such as Honda generators. It may slip in line of a ATV too i dont know. But it is going to fool most people as they dont know they exist. Almost undetectable. Here is a picture of it in the package and is so small you can hardly see it.
cvphoto91763.jpg
 
Click off that capitals lock Gene .... no need to YELL. My laptop speaker is vibrating. To solve the filter problem, I'd buy a filter with a tin body, that way what happens inside is a mystery but as long as it works, then that'd work for me I guess.
 

Replace or clean the screen above the bowl.
Replace or clean the screen that might be standing up inside the tank at the outlet.
Replace or clean the screen that might be at the carb inlet.

And if your tractor has steel or copper fuel line, keep it that way.
Why convert to hose?
From sediment bowl to carb you have four places a leak might take place. Now add a filter using hose, you now have six places to leak.
Add in a shutoff solenoid, now you have ten places to leak.
 
(quoted from post at 07:05:37 06/13/21)
(quoted from post at 17:47:35 06/12/21) I installed a translucent in-line fuel filter in fuel supply of the Farmall H for my friend. Same tractor that had what we thought was a slow fuel supply, not allowing the tractor to keep running. The new inline filter was installed b/c the screen in the inlet pipe to the carb was damaged and no longer useable.
So, we noticed that the new filter does not get full of fuel. It levels off at about the outlet pipe/line position in the filter. I would have thought that when the float in the carb shut off flow, the inlet fuel line would fill up all the way back to the sediment bowl. Nope, apparently not. Why not?
We can see the fuel flowing into the filter (which is a good improvement) when the engine is running, but still the level in the filter never gets above the outlet line.
We do have adequate flow now to keep the tractor running, so we drove it up the road to see if it would accept loads, and it did just fine. All seems to be working now, even with the filter never really filling up with fuel....any ideas about this?
Click to expand...
The filter will work until it stops up, restricted with what it filters.
If you want the air bubble gone, tilt the filter so the bubble can go uphill towards the fuel tank. Gravity will fill the void with fuel and push the air up. If your fuel line has up and down turns, the bubble will travel up but not back down, with slow gravity flow.
A fuel pump would push the bubble up or down, given adequate flow rate.

This post was edited by racered57 on 06/12/2021 at 06:12 pm.
Click to expand...

10-4

You put a filter on it stops up it must be the filter are some other lame excuse you read on the net. Some are insane and repetition this 30 times and blame it on a filter that has done its job...

One thing is for sure it it traps air you don't have a leak...

Good clean fuel is hard to beat no filter needed : )
 

Hey, I like this idea "stop looking at it""...since the tractor is running like it's supposed to now, no need to worry about how much fuel is in the inlet line. It's got enough to run...what else could a guy want...
Thanks for all the feedback....I didn't mean to create a firestorm amongst friends in the process.

FWIW, the screen above the sediment bowl is now removed, and the small screen at the inlet to the carb is also removed (it was badly damaged and not doing much anyway) so I'm fully counting on the new inline filter to do its job. :D
 


Bsmart, if you really want the filter to fill with fuel you need to allow the air out. This is the same as the drain plumbing in your house. If you get a hose clamp to fit the filter, and a piece of rubber that just fits under the clamp, then you can drill a small hole to let the air out, then turn on the gas and as soon as the air is all out slide the clamp and rubber over the hole and tighten the clamp. Or you could just ignore the air since it doesn't matter.
 
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