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HOLY CATS!!! you are doing some amazing work in this thread. as you stated, its probably not the best idea to ppump a 6.7, but god damn, you are making that engine your b!tch!
 

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Discussion Starter #84
HOLY CATS!!! you are doing some amazing work in this thread. as you stated, its probably not the best idea to ppump a 6.7, but god damn, you are making that engine your b!tch!
Thanks bro... It really is a pain to p-pump the 6.7, I didn't really have to create a mechanical gear type fuel pump. I could have just used an electric pump. However, with an engine driven fuel pump, I don't have to worry about an electric pump going bad or have to pay top dollar for one.
 

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Discussion Starter #85
Finally, here is the finished product. Hopefully I will have some time this weekend to see how well it runs. The beauty of the M35A2 fuel pump is that it has an internal bypass. This means that I can temporarily use an in-tank pump to prime the fuel system if there is any air in the line. Once the line is primed, the pump can be turned off and the motor should run with only the mechanical pump.
 

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Finally, here is the finished product. Hopefully I will have some time this weekend to see how well it runs. The beauty of the M35A2 fuel pump is that it has an internal bypass. This means that I can temporarily use an in-tank pump to prime the fuel system if there is any air in the line. Once the line is primed, the pump can be turned off and the motor should run with only the mechanical pump.
That is very cool! How much fuel can that pump supply?:drool2:
 

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Discussion Starter #87
I'm not sure how much in volume. I know on the M35A2, the pump can easily pressurize the fuel to 60-70 psi at around 2500 RPM. It is a big gamble to see if it works on my Cummins engine. I suspect that it is more than enough fuel. The excess will just go through the relief valve and back to the tank.
 

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So did this get finished?
 

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I'm also curious about the state of this build. I'm looking at building a pure mechanical Cummins for a 1972 application, and have been exploring options of just using a "stock" (it won't really be stock, but you know what I mean) 12v with p-pump, fitting a p-pump to a 24v 5.9, or possibly even doing something like this.

Does the 6.7 not have an engine driven lift pump like the VE 12v does? Is that why you need the M35A2 fuel pump?
 
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