4BT Lift Pump Piston type vs. Diaphragm - Dodge Cummins Diesel Forum
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Old 04-15-2012, 06:10 PM   #1 (permalink)
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4BT Lift Pump Piston type vs. Diaphragm

I have a 4bt (2002 Reman by cummins) that has a diaphragm lift pump. I am going to swap it into a f150 and run WVO. It has been suggested that I blank off the diaphragm pump and use a seperate FASS pump. i have located the piston type pump by delphi that looks like it would be a direct bolt up replacement.

Anyone have any experience with this? I have also read of a viton diaphragm for the stock lift pump on my 4BT? Any suggestions? My last thought would be in regard to the piston lift pump-- if it doesn't have viton seals would i be any better off?
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Old 04-15-2012, 06:40 PM   #2 (permalink)
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The only difference between a 4BT and a 6BT is the back 2 cylinders are cut off, so most parts are interchangeable. Since your 4BT has a diaphragm LP you must have a VE IP?

You can use the low pressure piston pump but might want to regulate it so you don't blow the IP seals out. I would suggest using the stock pump and put a fuel pressure gauge on it, along with a new filter and see what your pressure is. I would say the LP should be between 3-5 psi. I was reading on a Mercedes diesel site about people using WVO and they suggested a Facet Posi-flo 60301 electric pump it held up good with the WVO.
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Old 04-15-2012, 10:55 PM   #3 (permalink)
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Quote:
Originally Posted by 9297oldram View Post
The only difference between a 4BT and a 6BT is the back 2 cylinders are cut off, so most parts are interchangeable. Since your 4BT has a diaphragm LP you must have a VE IP?

You can use the low pressure piston pump but might want to regulate it so you don't blow the IP seals out. I would suggest using the stock pump and put a fuel pressure gauge on it, along with a new filter and see what your pressure is. I would say the LP should be between 3-5 psi. I was reading on a Mercedes diesel site about people using WVO and they suggested a Facet Posi-flo 60301 electric pump it held up good with the WVO.
Correct the injection pump is a VE. I've read that the lift pump max should be about 12 psi. The piston type Lift is a 2nd gen pump, but i believe it will fit the 1st gen stuff. I've got a 6bt as well and would swap them both over at the same time. What kind of regulator are you refering to? Does it have a built in bypass to prevent over pressuring it or what?
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Old 04-15-2012, 11:12 PM   #4 (permalink)
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I'm talking about a fuel pressure regulator like you would get at Summit or Jegs that you would use to regulate the fuel pressure.

The 2nd gen lift pump will put out over 25 PSI and the pressure is regulated at the IP with a bypass valve regulated at 25PSI. You can get a low pressure piston pump like the 2nd gen's that a few people use on there 1st gens I think it puts out around 15 PSI.

Since your wanting to use it on a 4BT it might be to much fuel for only 4 cyls. The 1st gens stock LP is rated at 3-5 PSI. which is i'm sure the 4bt is.
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Old 04-18-2012, 04:46 PM   #5 (permalink)
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I've been running bio in my 6bt and 4bt for years, the stock diaphram lp only lasted a few hundred miles, the low pressure piston lp was originally used in the 4bt with a p-pump which is what my 4bt has, i put one on my 6bt w/VE and its been working great, been almost 2 years, the only problem i have now is the fuel shut off solenoid has a rubber tip that gets eaten up by the bio, takes a while but it happens.
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Old 04-19-2012, 04:42 PM   #6 (permalink)
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The delphi low pressure piston lift pump that dap and ofi sells are for a 4bt mine is 12 psi at idle

Sent from my DROIDX
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Old 04-20-2012, 08:43 AM   #7 (permalink)
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Quote:
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The delphi low pressure piston lift pump that dap and ofi sells are for a 4bt mine is 12 psi at idle

Sent from my DROIDX
So is 12 psi within an acceptable range that won't cause any problems?
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Old 04-20-2012, 09:08 AM   #8 (permalink)
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Yea 15 psi can be ran on a ve and it not be damaged beyond that you can push out the front seal

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