Fuel line check valve
Thread Starter
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Fleet Mechanic
Joined: Jan 2007
Posts: 1,847
Likes: 37
From: Eastern shore,Salisbur,MD
Fuel line check valve
Hi gang. Took the truck out to a cruise in yesterday. Great time. But the reason for this post is a question on check valves for a fuel line. My truck after setting for a period, the fuel in the see thru filter siphons back to the tank, thus giving me cranks to get the fuel up to the carb. .I am thinking of putting a check valve before the fuel filter to eliminate this. Any thoughts or brands of check valves
thanks
thanks
Thread Starter
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Fleet Mechanic
Joined: Jan 2007
Posts: 1,847
Likes: 37
From: Eastern shore,Salisbur,MD
Ross. Thanks. Here is another question On the fuel pump, there is the glass bowl. After the pump there is a see thru filter. Now, if the fuel was siphoning back to the tank, would there be gas in the fuel pump bowl or would that be empty. The truck is not here. stored about 9 miles from here. If there was a small leak in the bowl gasket, would there be gas in the bowl, since that is the lowest point
Fleet Owner
Joined: Jul 2004
Posts: 27,283
Likes: 1,046
From: NM
I was thinking about that. I assume this is some kind of Y-block? On flatheads, the inlet to the bowl ( line from tank) just dumps into the glass bowl, and is sucked out the top-middle of the metal FP casting. There would be no way for fuel to be siphoned out of the bowl itself. Likewise a bowl gasket that leaked would only let a little gas leak out when it's just sitting. So the fuel in the bowl must be vaporizing and pushing gas back to the tank. A check valve would prevent that, but might just force the vapors to push gas into the carb?
Does your truck have a saddle type gas tank or is it in the cab?
Does your truck have a saddle type gas tank or is it in the cab?
Fleet Owner
Joined: Dec 2000
Posts: 25,310
Likes: 5,348
From: Central PA
Jim, I hope this is not a hijack, but I have the same problem with my 54. My truck will start easily if I ran it the day before but.... For instance I took the truck out on Thursday. I didn't drive it Friday. Yesterday, Saturday, it didn't start. I too have a see through filter. It had very little gas in it. Cranking long will not start it. I have to shoot some ether or gas into the carb to get it to fire.
Background: in January 2020 I put a new tank in. I put a new fuel lined in, hard and soft. Some car buddies have said I have a leak in one of my hose clamps. I tightened them all.
So, what is the cause? Is fuel leaking out of the carb bowl? Apparently gas is running down the line, and past the fuel filter. There must be an air lock that prevents the pump from pumping fuel up the line. Advice?
Background: in January 2020 I put a new tank in. I put a new fuel lined in, hard and soft. Some car buddies have said I have a leak in one of my hose clamps. I tightened them all.
So, what is the cause? Is fuel leaking out of the carb bowl? Apparently gas is running down the line, and past the fuel filter. There must be an air lock that prevents the pump from pumping fuel up the line. Advice?
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Thread Starter
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Fleet Mechanic
Joined: Jan 2007
Posts: 1,847
Likes: 37
From: Eastern shore,Salisbur,MD
Thanks Ross. the truck is a 54 F-750 with a 279 YBlock lincoln the fuel tank is not in the cab, but sits down below. I would like to check it again when I go up to get it the next time to see if there is any gas left in the fuel pump bowl. Wish the truck was here. I will have to wait a while to give it time to do its thing. I will let you know what I fine
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Fleet Owner
Joined: Jul 2004
Posts: 27,283
Likes: 1,046
From: NM
If you don't have a FP diaphragm made to resist gasohol and other modern fuels, you'll fight these kinds of problems. An electric pump would eliminate many problems, but with the suction coming off the top of the tank, that's not ideal for any pump. Putting the suction off the bottom of the tank would help a lot.
Fleet Owner
Joined: Dec 2000
Posts: 25,310
Likes: 5,348
From: Central PA
Thanks Jim. I have been meaning to start a thread about my problem but I'm glad you did.
Thread Starter
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Fleet Mechanic
Joined: Jan 2007
Posts: 1,847
Likes: 37
From: Eastern shore,Salisbur,MD
Abe, I have a remote terminal under the hood to connect a trigger starter button to so i can see what is happening when I crank it. It would be interesting to see what is happening to the fuel filter when you crank the engine. Hard to see from the drivers seat.Is it filling or not? Just a thought
Thread Starter
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Fleet Mechanic
Joined: Jan 2007
Posts: 1,847
Likes: 37
From: Eastern shore,Salisbur,MD
Ross, that is an interesting notation. I may be able to call the company that rebuilt it and ask them what they might have used in the rebuilding process, although it has been a bunch of years. I still have the records. I had a electric pump when I first got the truck and used one while rebuilding the truck. One of the pumps put out to much pressure .
Logistics Pro
Joined: Nov 2006
Posts: 3,663
Likes: 363
From: Fallon,NV & Bainbridge OH
Any carbureted vehicle with a fuel bowl should start off fuel in the carb and then the lines will be refilled. I would be looking at a fuel leak issue in the carb, Rochester's were famous for leaking out of the plugs on the bottom of the fuel bowl creating all types of issues. Granted if a vehicle sits for a couple weeks in warm/hot weather the bowl fuel can evaporate but other than that the fuel bowl should hold fuel for the engine to run, that is what it is designed to do. Check for internal leaks in your carb.
