Fuel Starvation (temporary)
Thread Starter
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More Turbo
Joined: Sep 2021
Posts: 507
Likes: 39
Not true. The key to the return system is the orifice in the fitting that you use at the carb. Your pump has the ability to supply way more fuel than your engine would ever need. So when the carb says "I have enough" in your system now, the fuel just stands still in the fuel line, and the fuel pump has a pressure relief inside it, so the fuel just recirculates in the pump. It's most likely set at around 5 psi.
With the return system the factory had a tee fitting near the input to the carb, where most of the fuel goes to the carb, but a certain portion is let through a orifice and down a return line to the tank. If your sending unit is original to your truck and your truck had this system on it, you will have two pipes on the sending unit, one supply and the other return. Your return is un used and probably blocked off if you have it.
Here's the original orifice piece. I do not know where you could get it. https://www.fordpartsgiant.com/parts...z-9n176-b.html
Here's some more info with some orifice sizes. https://www.garysgaragemahal.com/fue...separator.html
With the return system the factory had a tee fitting near the input to the carb, where most of the fuel goes to the carb, but a certain portion is let through a orifice and down a return line to the tank. If your sending unit is original to your truck and your truck had this system on it, you will have two pipes on the sending unit, one supply and the other return. Your return is un used and probably blocked off if you have it.
Here's the original orifice piece. I do not know where you could get it. https://www.fordpartsgiant.com/parts...z-9n176-b.html
Here's some more info with some orifice sizes. https://www.garysgaragemahal.com/fue...separator.html
Lead Driver
Joined: Apr 2002
Posts: 5,309
Likes: 1,243
Take a look at Summit Racing for Edelbrock spacers
https://www.summitracing.com/search/...uretor-spacers
Choose one that will give the most insulation at a thickness that won't cause you set up issues such as linkage and head room. I'd call summit and ask them what they recommend. Someone may have good advice on that here too. Phenolic or wood fiber composite. Which ever has good R value.
https://www.summitracing.com/search/...uretor-spacers
Choose one that will give the most insulation at a thickness that won't cause you set up issues such as linkage and head room. I'd call summit and ask them what they recommend. Someone may have good advice on that here too. Phenolic or wood fiber composite. Which ever has good R value.
Lead Driver
Joined: Apr 2002
Posts: 5,309
Likes: 1,243
On whether or not to add a return line...if you are running fine normally then I don't think there's a big advantage for you. You have a pump on the frame rail and pushing fuel to the carb. Yeah I guess that recirculating fuel back to the tank would help with a mechanical pump with fuel on the suction side tending to vaporize. And with in tank pumps the return acts as a fuel delivery modulator. Then it returns fuel, but is that amount of return fuel going to affect the temperature of fuel leaving the tank? The difference would be small compared to the temperature rise of the fuel in the carb on a shut down. If you can solve the hot carb issue with a spacer and or a shield I'd skip the return line effort.
Lead Driver
Joined: Jun 2013
Posts: 5,667
Likes: 1,159
From: Tolland, CT
You may want to call Edelbrock and see what they recommend also. Ask for tech support. I have found good tech support from the automotive places I have called in the past.
I'm thinking you want something like this,
https://www.google.com/search?q=meta...hrome&ie=UTF-8
I'm thinking you want something like this,
https://www.google.com/search?q=meta...hrome&ie=UTF-8
Lead Driver
Joined: Jun 2013
Posts: 5,667
Likes: 1,159
From: Tolland, CT
I believe he has a manual choke. You can see it in the pictures. Oh, that may have been in the other thread...
Thread Starter
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More Turbo
Joined: Sep 2021
Posts: 507
Likes: 39
Take a look at Summit Racing for Edelbrock spacers
https://www.summitracing.com/search/...uretor-spacers
Choose one that will give the most insulation at a thickness that won't cause you set up issues such as linkage and head room. I'd call summit and ask them what they recommend. Someone may have good advice on that here too. Phenolic or wood fiber composite. Which ever has good R value.
https://www.summitracing.com/search/...uretor-spacers
Choose one that will give the most insulation at a thickness that won't cause you set up issues such as linkage and head room. I'd call summit and ask them what they recommend. Someone may have good advice on that here too. Phenolic or wood fiber composite. Which ever has good R value.
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Joined: Jan 2001
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From: Virginia
On whether or not to add a return line...if you are running fine normally then I don't think there's a big advantage for you. You have a pump on the frame rail and pushing fuel to the carb. Yeah I guess that recirculating fuel back to the tank would help with a mechanical pump with fuel on the suction side tending to vaporize. And with in tank pumps the return acts as a fuel delivery modulator. Then it returns fuel, but is that amount of return fuel going to affect the temperature of fuel leaving the tank? The difference would be small compared to the temperature rise of the fuel in the carb on a shut down. If you can solve the hot carb issue with a spacer and or a shield I'd skip the return line effort.
Lead Driver
Joined: Jun 2013
Posts: 5,667
Likes: 1,159
From: Tolland, CT
Well, tried to copy and paste from post #1.https://www.ford-trucks.com/forums/1...e%20a%20kitten.
After 1.5 hours of sitting, it started up.
So, is that because the vacuum in the tank released ?
Again, I don't know how fuel from the tank is lifted out the top of the tank and feed to the Edelbrock fuel pump on the rail. I assume the pump will pull fuel up out of the tank ?
Lead Driver
Joined: Apr 2002
Posts: 5,309
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We don't know how the fuel line is routed. Maybe it is getting a lot hotter than a normal fuel line run?
Thread Starter
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More Turbo
Joined: Sep 2021
Posts: 507
Likes: 39
im in the process of the spacer and lifting fuel lines. I’m also replacing the fuel pump for the heck of it…thank you
Lead Driver
Joined: Apr 2002
Posts: 5,309
Likes: 1,243
There's no better reason I can think of besides the heck of it. Good luck!