lift pump question
Thread Starter
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New User
Joined: Jun 2008
Posts: 4
Likes: 0
From: Pittsburgh, PA
lift pump question
Hi Folks,
I'm new here and I need some help. I jumped into a major project on my first diesel ('99 f250). I'm installing a conversion kit to run veg oil and I may be in a little over my head (I'm not really much of a mechanic, but can't afford to pay for someone else to install it). My question isn't about the conversion itself, but while I was working with the fuel lines around the lift pump I noticed that the inlet and outlet on the pump are 5/16" lines while the rest of the supply line is 3/8". Is there a good reason for this or did the previous owner cheat and put in an incorrect part? My first clue was some crazy patched together lines just before the pump and a slow fuel leak as a result.
Ross
I'm new here and I need some help. I jumped into a major project on my first diesel ('99 f250). I'm installing a conversion kit to run veg oil and I may be in a little over my head (I'm not really much of a mechanic, but can't afford to pay for someone else to install it). My question isn't about the conversion itself, but while I was working with the fuel lines around the lift pump I noticed that the inlet and outlet on the pump are 5/16" lines while the rest of the supply line is 3/8". Is there a good reason for this or did the previous owner cheat and put in an incorrect part? My first clue was some crazy patched together lines just before the pump and a slow fuel leak as a result.
Ross
Gone, but not forgotten
Joined: Oct 2005
Posts: 5,026
Likes: 2
From: Charlotte-Fairbanks-Bflo
I can only guess that the installer of the pump was cutting corners to save money. Welcome to FTE, and someone that can do better than guess will give you a better answer.
Post Fiend
Joined: Nov 2007
Posts: 9,549
Likes: 14
From: Payson, AZ
Welcome to 
.
Like Mark said, PO may have used his own Rube Goldberg way of installing a fuel pump.
Or, and this is also a guess, the previous owner may have done an in-tank mod and installed a pre-pump fuel filter which is now missing. It would be nice to have a pic of what you see.
This is the stock connector that should be at the back of the fuel pump.
This is a pic of my pre-pump filter for illustration of what he may have done.
.Like Mark said, PO may have used his own Rube Goldberg way of installing a fuel pump.
Or, and this is also a guess, the previous owner may have done an in-tank mod and installed a pre-pump fuel filter which is now missing. It would be nice to have a pic of what you see.
This is the stock connector that should be at the back of the fuel pump.
This is a pic of my pre-pump filter for illustration of what he may have done.
Thread Starter
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New User
Joined: Jun 2008
Posts: 4
Likes: 0
From: Pittsburgh, PA
Thanks for the photo. You're right about the prefilter being removed. I was told it was all stock, no mods when I bought it so I don't think he did anything in-tank. The connector is the same as shown in your image. How important is it to get the right size pump in there?
Ross
Ross
Post Fiend
Joined: Nov 2007
Posts: 9,549
Likes: 14
From: Payson, AZ
Thanks for the photo. You're right about the prefilter being removed. I was told it was all stock, no mods when I bought it so I don't think he did anything in-tank. The connector is the same as shown in your image. How important is it to get the right size pump in there?
Ross
Ross
You will see that the size of the Walbro is smaller but it is rated at a higher pressure and volume than the stock pump. 60 to 65 PSI at wide open throttle is what most like to achieve. A few have mounted a pump in the tank to ensure no air enters the fuel system.
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