In-tank pump
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Elder User
Joined: Aug 2007
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From: South-Central Kentucky
In-tank pump
I was not able to find any info on this thru the search function so I thought that I would start yet another thread. As most of you know, I am converting a 2000 F-250 gasser to a 7.3L diesel. Also, as most of you know, the gasser has the fuel pump in the tank. The question is, "Can I use this in-tank pump with the diesel system? Will it over pressurize, not supply enough flow?" Any suggestions/criticisms would be greatly appreciated. Mike.
Post Fiend
Joined: Feb 2006
Posts: 11,892
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From: Middle Tennessee
Probably will not supply sufficient fuel. Gassers are designed to supply around 40psi. We need a minimum of 65 and that in tank unit is not going to get you there. Kwikk is the poster/originator of the in tank pump mod and is very happy with it. I cut a hole in the bottom of my tank and sumped it. I am happy with my results. I am sure Dan will be along sometime to post a link. I think my mod is actually illegal for street use. Oh well.
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Elder User
Joined: Aug 2007
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From: South-Central Kentucky
Isn't Dan on vacation or something? Actually, I was thinking of it more as a helper pump if it could keep up with the rate of flow then the stock pump could then raise the pressure up to the necessary level.
Lead Driver
Joined: Jun 2003
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From: Damon (South East Texas)
I have seen the in tank pumps capable of up to 100 psi on a Ford gasser when the fuel return was restricted. The regulator keeps the pressure in check just like our diesels. The high pressure delivery of the pump keeps up the volume requirements of the engine. I once had an adjustable fuel regulator on a gas pickup, of mine, and could easily get over 60 psi on the rail when "cranked down".
Post Fiend
Joined: Feb 2006
Posts: 11,892
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From: Middle Tennessee
Roland, you have seen those units compared to our stock Bosch ones. They will suffer from the same problem. If you load them up, they will have a short life. Even shorter than our stock units because that was not how they are/were designed to operate. I am sure you know this.
Even the manual states that operation at above designed pressure specs will result in shortened life expectancy.
Even the manual states that operation at above designed pressure specs will result in shortened life expectancy.
Lead Driver
Joined: Jun 2003
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From: Damon (South East Texas)
My point was that the factory gas fuel pump was of the high pressure variety. I realize that there would be a shortened life span to any pump pushed beyond its N.O. pressure. I just think a low pressure high volume pump would act better as a lift pump in the tank. Not a lot of pressure is needed on the inlet side of our stock in frame pumps.
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Elder User
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From: South-Central Kentucky
The gas pump is a lower pressure rating than our pump, however, I am just trying to find out if using the gas pump as a lift pump would be beneficial or not. If it cannot keep up with the volume then it becomes a restriction. If it can keep up with the necessary volume, then it should help take a load off of the stock pump and help eliminate some of the air in the lines, which results in a happier, and quieter engine.
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Lead Driver
Joined: Jun 2003
Posts: 8,298
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From: Damon (South East Texas)
I researched a fuel pump manufacturers specs for the gas and diesel fuel pumps for a 2000 F250. The gas pumps have a slightly lower pressure @ 75-90 psi, but a higher volume @ 55-65 gals/hr versus the diesel @ 95-110 psi and 35-45 gals/hr. This may help answer your question.
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Elder User
Joined: Aug 2007
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From: South-Central Kentucky
Thanks, Roland. Then it looks like I could use the in-tank pump as a sort of lift pump and the frame pump could bring the fuel up to pressure, that way it should help to eliminate a lot of air that these fuel systems are notorious for.
Lead Driver
Joined: Jun 2003
Posts: 8,298
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From: Damon (South East Texas)
You may still need to mod the return line further from the pump inlet. I'm not sure how it dumps back into the tank on this set up.
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Elder User
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From: South-Central Kentucky
I'll be checking it out tomorrow since I need to drop the tank to empty anyway. I just thought that since I had everything sitting here in one place it would be a good time and and easy way to do this mod.
Lead Driver
Joined: Jun 2003
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From: Damon (South East Texas)
Have you looked at it yet? Does it have the module type plastic pump or the metal one that mounts to the pickup tube?
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Elder User
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From: South-Central Kentucky
Here is a picture of the pump. Dan(Kwik) said that the only thing that he would be worried about would be a plastic line rupturing? The best way to describe this is that it sits down inside a plastic bowl in the tank with a lid screwed on, and the return line also comes into the bowl rather than the tank.
The best way to describe this is that it sits down inside a plastic bowl in the tank with a lid screwed on, and the return line also comes into the bowl rather than the tank.
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From: Wake Forest, NC
This was how the older trucks worked, prior to 1990 iirc. They had a low pressure lift pump in the tank, and a high pressure one on the frame under the drivers feet. With two tank trucks, the low pressure pumps switched the selector valve over. it is just a mechanical bias valve, it switches the outlet to the inlet with pressure. the big pump on the frame boosted pressure from there.