Stock fuel pressure and volume

[ScottLewis]

A buddy asked me if I knew what fuel pressure and volume our stock '05 and '06 truck lift pumps produced. I was surprised that I couldn't readily locate the specs. in the '06 manual and I couldn't find it in searches of TDR forums. I did find data for BD's aftermarket pump but that was all.



Can anyone give me the figures?



Dan

 

[mhenon]

A buddy asked me if I knew what fuel pressure and volume our stock '05 and '06 truck lift pumps produced. I was surprised that I couldn't readily locate the specs. in the '06 manual and I couldn't find it in searches of TDR forums. I did find data for BD's aftermarket pump but that was all.



Can anyone give me the figures?



Dan

The in-tank pump module puts out about 8psi max and 5psi or less running down the road.

Mike

 

[Tryingit]

For the 04. 5 (600) its around 8psi and can drop to around 4psi. That is considered normal in the 600 motors. It is listed on the Piers site.

Mine runs around 7psi, but I couldn't get all of the air out of the line.



http://www.piersdiesel.com/TechIsolator.htm

 

[Lektrikman]

Dan, I've got an 05 and have a gauge on the inlet to the CP3 with a 7 micron fuel filter installed. I run 8. 5-9. 0 psi at idle and cruising down the road at the speed limit, and pressure drops to 6-7 psi when I stand on it. Hope this helps... ... ... . Lektrikman

 

[OPoole]

I would not buy a carter pump they die way to soon! No luck with them look into a FASS system or something.

 

[GSchroder]

Does anyone know the volume (gallons per hour) of the stock lift pumps? It slooks like everyone agrees around 5-8+- psi.

 

[mhenon]

Does anyone know the volume (gallons per hour) of the stock lift pumps? It slooks like everyone agrees around 5-8+- psi.

DC says it's a "high Volume" "low pressure" pump. I'm calling BS on that one. If the fuel line diameter hasn't changed (and it hasn't). . then lower pressure means less volume or flow.

I assume none of this matters to the 3rd generation engines and that the volume is sufficient. On the 2nd gen engines though it just means less pressure for an already weak system.

Mike

 

[ScottLewis]

Thanks for all the responses. I'm now a little wiser and appreciate the wealth of information available through our membership.

The only reference to the volume produced by the in-tank pump I could find in the '06 manual is:



The fuel volume of the transfer pump will always provide more fuel than the fuel injection pump requires. Excess fuel is returned from the injection pump through an overflow valve, and then back to the fuel tank.



A pretty nebulous description at best.



Thanks again.



Dan

 

[pwr2tow]

DC says it's a "high Volume" "low pressure" pump. I'm calling BS on that one. If the fuel line diameter hasn't changed (and it hasn't). . then lower pressure means less volume or flow.
I assume none of this matters to the 3rd generation engines and that the volume is sufficient. On the 2nd gen engines though it just means less pressure for an already weak system.
Mike

Pressure and flow is also relavent to restriction. The CP3 sucks fuel better than a VP44 so flow would increase but pressure would drop using the same diameter fuel lines. There is also less restrictions in the CP3 fuel system from tank to CP3. Less restriction means more flow and less PSI.

 

[rbattelle]

The fuel volume specification for the 2003-2004. 5 trucks is 38 GPH minimum at the CP-3. That specification isn't in the regular service manual - you have to have the Powertrain Diagnostics Manual.



I imagine the minimum volume is a little higher for the higher horsepower trucks (2004. 5-up).



Ryan

 

[mhenon]

Pressure and flow is also relavent to restriction. The CP3 sucks fuel better than a VP44 so flow would increase but pressure would drop using the same diameter fuel lines. There is also less restrictions in the CP3 fuel system from tank to CP3. Less restriction means more flow and less PSI.

I didn't make my point clear enough with that last post. When DC replaced the engine (2nd gen engines now) mounted Carter LP (15psi) with the in-tank pump (8psi) they claimed the intank was a "low pressure-high volume" pump. They were inferring that just because the pressure was lower than the Carter. . not to worry... the new in-tank pump was high volume and you would get more fuel to the VP. It just can't happen. The restriction (fuel line diameter) stayed the same and pressure dropped (from 15psi to 8psi). There's no way it flows more fuel to the VP. That's why most of us went after market to get the pressure (therefore flow) back up.

You're right on the CP3 drawing more fuel. That's why it does fine with the in-tank providing 8psi of boost. It's a gear driven pump like a RASP and could probably get by with no boost pump at all.

I'll stand by my original statement however. DC was blowing smoke when they claimed an 8psi pump put out a greater volume of fuel than a 15psi pump given the same diameter fuel lines.

Mike

 

[MPletchetero]

fuel volume spec for the CR motor is 430ml every 10 seconds minimum which is roughly 40 GPH.

 

[MPletchetero]

I just double checked the information from TSB 14-003-06 (Cummins Diesel Diagnostics).



For 2003-2004 volume spec is 560mL in 10 seconds or better (52 GPH)

For 2004. 5-2006 volume spec is 590mL (55GPH)

 

[rbattelle]

I just double checked the information from TSB 14-003-06 (Cummins Diesel Diagnostics).



For 2003-2004 volume spec is 560mL in 10 seconds or better (52 GPH)

For 2004. 5-2006 volume spec is 590mL (55GPH)

Wow, that's higher than the Powertrain manual indicates.



Ryan

 

[pwr2tow]

I just double checked the information from TSB 14-003-06 (Cummins Diesel Diagnostics).

For 2003-2004 volume spec is 560mL in 10 seconds or better (52 GPH)
For 2004. 5-2006 volume spec is 590mL (55GPH)

Must be less restriction somewhere because those are higher flow numbers with less PSI than the second generation trucks.

 

[robertyoke]

I would not buy a carter pump they die way to soon! No luck with them look into a FASS system or something.

somthing like a gl392 warbro pump like gdp kit is a good bet. Quiet and reliable plus moves fuel.

-robert