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fuel delivery problem

A

Anonymous-0

Well-known Member
I have retored a 1950 Farmall C. Recently, it has been stalling after about 15 minutes. The clear plastic fuel filter I installed shows that the gas flow has stopped. The filter is new and clean. The sediment bowl, petcock and fuel line into the filter are clear. The line from the bowl to the filter is clear. When I drained from the carb end of the line, I got a strong, continuous flow of fuel, so I know the entire line is open. The gas cap vent is open and clear.
What could be causing the fuel flow to stop?
One thought is that, although the filter was placed 1.5" from the block, perhaps engine heat is causing a vapor lock, thus pressurizing the flow. Thanks for any help.
 

Remove that in-line filter, replace it with a short piece of fuel line. If that doesn't fix it, you have problems inside the carburetor. Also, do not rule out an ignition problem. A failing ignition coil will exhibit the same symptoms.
 
Rusty is on to it. Those little filters have no flow if tiny little particles get into them, but they look clean as a whistle. If you believe you need a filter, NAPA has a design that is for gravity feed fuel. If the coil is way to hot to put your hand on when it quits, that is the issue. Jim
 
The response made by some to the sediment problem is a normal one, but simply doesn't make sense, at least to me. The recommendation is remove and throw away the small in-line filter because it gets clogged up too easy. Stop and think about that response. Would you rather have had that sediment in your carburetor so you can have fun taking your carburetor apart or is it easier to deal with it in the in-line filter. The little in-lines are very easy to service. When it gets clogged, take it off and, with a low pressure hose, blow the crud out of the filter in the reverse direction of the gas flow. You may need to use a little clean gas along with the air pressure. Most of the time that is all you need to do to clean it up and you are ready to re-install. Believe me, I would rather have the crud in my in-line than in my carburetor.
 
(quoted from post at 04:31:02 08/30/10) The response made by some to the sediment problem is a normal one, but simply doesn't make sense, at least to me. The recommendation is remove and throw away the small in-line filter because it gets clogged up too easy. Stop and think about that response. Would you rather have had that sediment in your carburetor so you can have fun taking your carburetor apart or is it easier to deal with it in the in-line filter. The little in-lines are very easy to service. When it gets clogged, take it off and, with a low pressure hose, blow the crud out of the filter in the reverse direction of the gas flow. You may need to use a little clean gas along with the air pressure. Most of the time that is all you need to do to clean it up and you are ready to re-install. Believe me, I would rather have the crud in my in-line than in my carburetor.
Click to expand...

The sediment bowl already has a very fine mesh filter screen in it that is equal in filtering capability to ANY in-line filter, plus, the sediment that is blocked by the filter in the sediment bowl is then trapped in the glass bowl, and you simply shut off the fuel, remove the glass bowl, and clean it out. And, if the sediment bowl doesn't catch it, there is another equally fine mesh screen located in the fuel inlet fitting of the carburetor. Plain and simple, there is NO need for any additional fuel filters.
 
I have worked on tractors (and cars) for 45 years professionally. In that time I have replaced thousands of filters. the most commoly found issue with small add on plastic filters is invisible plugging. OK it is possible to back flush them. but using a gravity designed filter will make that irrelevant, (the filter/screens in the system are good to go as they came from the factory.) But those plastic filters are not my friend. Jim
 
If the existing system is satisfactory, why would you be concerned about having an extra in-line in the system since nothing would get to it because the original equipment would capture it all? Mind you, I'm not advocating throwing away the existing filtering systems, but using the in-line as a backup. Most of these sites are full of carburetor sediment problems, which indicates to me that there is an issue with the original equipment not catching it all.
 
(quoted from post at 04:31:02 08/30/10) The response made by some to the sediment problem is a normal one, but simply doesn't make sense, at least to me. The recommendation is remove and throw away the small in-line filter because it gets clogged up too easy. Stop and think about that response. Would you rather have had that sediment in your carburetor so you can have fun taking your carburetor apart or is it easier to deal with it in the in-line filter. The little in-lines are very easy to service. When it gets clogged, take it off and, with a low pressure hose, blow the crud out of the filter in the reverse direction of the gas flow. You may need to use a little clean gas along with the air pressure. Most of the time that is all you need to do to clean it up and you are ready to re-install. Believe me, I would rather have the crud in my in-line than in my carburetor.
Click to expand...

The sediment particles that the filter stops wouldn't bother the carburetor or the engine.

These tractors have been running for upwards of 70 years with little more than a piece of window screen to filter the fuel. If you start with a clean tank and clean gasoline, and keep it clean, what little grit gets through will not affect the tractor in any way.
 
It is simply two factors. Most of the filters used are not designed for gravity feed with a pressure of just inches of fuel column when low in the tank.
The second is that tractors and rubber fuel lines cause fires. Not all, but a ruptured, failed, hose leaking on a starter is not good. 20 gallons of gasoline makes a powerful explosion in a barn, Jim
 
I appreciate your reasoned and legitimate comments. The great thing about forums like this is that they provide each of us with the pros and cons to make an informed decision. However, in the final analysis the decision is our own, which each of us must live with for better or worse.
 
(quoted from post at 10:41:16 08/31/10)
(quoted from post at 04:31:02 08/30/10) The response made by some to the sediment problem is a normal one, but simply doesn't make sense, at least to me. The recommendation is remove and throw away the small in-line filter because it gets clogged up too easy. Stop and think about that response. Would you rather have had that sediment in your carburetor so you can have fun taking your carburetor apart or is it easier to deal with it in the in-line filter. The little in-lines are very easy to service. When it gets clogged, take it off and, with a low pressure hose, blow the crud out of the filter in the reverse direction of the gas flow. You may need to use a little clean gas along with the air pressure. Most of the time that is all you need to do to clean it up and you are ready to re-install. Believe me, I would rather have the crud in my in-line than in my carburetor.
Click to expand...

The sediment particles that the filter stops wouldn't bother the carburetor or the engine.

These tractors have been running for upwards of 70 years with little more than a piece of window screen to filter the fuel. If you start with a clean tank and clean gasoline, and keep it clean, what little grit gets through will not affect the tractor in any way.
Click to expand...

There is a HUGE difference between window screen and that fine mesh, fuel filtering screen. The two should not even be compared. If you installed fuel filtering screen in your window, you would not be able to see through it unless you pressed your nose up against it, and the amount of air passing through would be very minimal compared to regular window screen.
 
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