Fuel line issue

[dunerunner09]

I have a clear fuel filter that runs into the carb..my question is does a fuel filter fill completly full of gas. The one i have that i just replaced fills only half way and was wondering if my fule pump is going out because my jeep will start but then dies like its not getting fuel...any help would be cool, thanks

 

[BusaDave9]

That is normal. When you start up the jeep fuel will flow. The filter doesn't have to completly fill up before fuel continues on to the carb.

 

[thistle3585]

I'm resurrecting this thread because I have a similar question, and wondered if the fuel filter's orientation has anything to do with the fuel flow. The fuel filter sits on its side and fuel bubbles in. I wondered if it would be better if it was situated at a different angle? Also, I have two fuel filters in line in the engine compartment. One sits up against the fender near the firewall. It has a line in and one out from the top of a cup in a V formation. The other the standard fuel filter that I referenced above. Is two of these necessary?

 

[Nomad127]

I use a clear filter also and have situated my so that gravity helps to keep air from entering the fuel line. I would think two is fine but not sure if it's necessary.

 

[jeffgtoman]

Sitting on it's side is better than being positioned vertical so dirt can settle below the inlet and outlet. Air will collect in the top but does not hurt anything. Any air that doesn't fit above the outlet will be pushed to the carb and exit out the carb vent. Fuel pumps make air bubbles in gas. It doesn't mean it is about to fail.

If your filter is mounted vertical with the inlet on bottom, debris will settle in the fuel line when you shut the engine off and the fuel pump will have to constantly push it back into the filter while pumping. This is a very common setup but should be changed if possible.

If your filter is mounted vertical with the outlet on bottom, dirt will settle in the filter ok but it will trap more air. This arrangement is the least likely since fuel pumps are mounted lower than carburetors.

 

[thistle3585]

Thanks for the info. You brought to mind another question with your comment about the carb vent. I have a 2100 carb on my AMC 304 , and there is an inlet/outlet that goes to the carb float. Is this what you are calling the "carb vent"? I have ran a line from it and put a similar clear fuel filter on it to filter the air that goes in to that bowl vent. My question is whether it matters which end of the filter is hooked up to the line? Is there a direction of flow?

 

[BusaDave9]

My question is whether it matters which end of the filter is hooked up to the line? Is there a direction of flow?

Yes. All filters (fuel, oil and air) have a specific direction of flow. If the flow is reversed the filter may distort and the fuel may get past the edge of the filter. The filter may even collapse.

 

[thistle3585]

Thanks, I guess I wasn't clear but I was trying to determine which direction the air flows from the float bowl vent. Is it pulling air in or pushing it out? I just wanted to make sure I had the filter running in the correct direction. Is there a better filter to use than a fuel filter? http://webspace.webring.com/people/dg/geer_hed/images/mc2100_vac.jpg

 

[jeffgtoman]

You don't need to put a filter on the vent. Some emissions systems put a hose there so they could catch the vapors and redirect them to be burned in the engine. A charcoal canister was often included. Unless you are required to pass an emissions test, leave it open to the atmosphere. Put nothing on it.