New Fuel Pump?

turboman1

turboman1

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Aug 20, 2008
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What setup of fuel pumps will provide sufficient flow and pressure to support 800 hp.

Is there a setup that can be used in conjunction with the stock lift pump... in series or parallel?

Found an electric pump that flows 100gph at 14 psi... could this be used in conjunction with the stock lift pump?

Thanks
Adam M.
 
Not quite a direct answer to your question, but you are going to need 45 psi or so of fuel pressure at the IP.
 
Some people will stack pumps with the stock one, but for 499$ you can get the AD150 at 40 psi and eliminate all the stock stuff. It provides plenty of fuel for a 13mm ppump.
 
Ok lets assume a BSFC of .44 lb/(hp*hr)

.44 lb/(hp*hr) * 750 hp = 330lb/hr

330lb/hr * 1gallon/7.5lb = 44gallons/hr is how much fuel is flowing through the motor at max hp.

Why do I need 180gph at 45psi? = $500

What is wrong with 110gph pump at 14psi... it looks like I am never going to exceed 110gph so the pump should never drop below 14psi. = $130

Is this math all wrong?

Thanks
Adam M.
 
You only need what you need, the rest is just going back to the tank. The main thing is keeping up with pressure under load and the extra volume should help cool the pump...
I also use that 110gph pump right along with a fresh stocker.... mine only did 12psi out of the box where thier suppose to be 14, I just tweak the relieve valve the same as with the OFV to get desired pressure.
 
I still disagree with modding the ofv is helping supply more fuel to the pump. If you put your finger over the end of garden hose, the pressure comes up but the flow goes down. So if you have to block the flow out of the pump to get desired pressure, then you stacked pumps are not big enough.

I heard that a vp44 will move 65 lbs per hour at its max.So it is safe to say that a ppump will need quite a bit more than that. True your pump will only need a certain amount and after that is is just cooling the pump down with recirculating fuel. Call the place that built your pump and ask them what they say you need to properly supply it with. I think like you guys on not giving in and spending unnessaserry money thats not needed. But you get a pump that will do any job, the filter kit and the hoses and wiring for $500. Plus the simplicity of eliminating connections that could leak or fail and making the truck have a cleaner appearance.

If the pump is 110gph at 14 psi, then pinch off the ofv until it runs 40 psi and then see how much flow it has. What is the rate of suction coming off the stocker and how does it compare to the flow coming out of the other pump. The stocker is a bigger pump so i think it would cause a restriction going to the stocker.
 
What I calculated was gallons of fuel a 750 hp truck uses per hour. That is the truck is making a constant 750 hp the whole hour. So if it only uses 44gallons in that hour and the fuel pump flows 110 gallons in that hour then you will have 110-44gallons = 66 gallons of diesel fuel flowed through the pump for cooling...Which I think would be quite a bit of cooling.

I would also think that at 45 psi the diesel fuel is going to get hotter which does not equal better cooling comparing this to 14psi the cooling would be much better.

If the motor ever gets to a point where it consumes more gph than the fuel pump... > 110gph then the fuel pump will loose pressure.

Talked to another guy today that has run the 110gph at 14psi pump on a 03 common rail around 700 hp and he said it never dropped below 14 psi... So we went ahead and got the 110gph @ 14psi pump and will see how it does. It has 3/8" lines and when you compare 140$ to 500$ it should work out pretty well. We will see though.

O and we are also going to buy an remote oil filter mount and buy a fuel filter from merles automotive and run it in front of the pump plus the stock filter...we will bypass the stock lift pump.

If anybody sees anything worng with my reasoning please let me know because I do not want to be telling people the worng thing or be putting someithng on my truck that is going to cause the ip to burn up.

Adam M.
 
ILLINOISRAM said:
If the pump is 110gph at 14 psi, then pinch off the ofv until it runs 40 psi and then see how much flow it has. What is the rate of suction coming off the stocker and how does it compare to the flow coming out of the other pump. The stocker is a bigger pump so i think it would cause a restriction going to the stocker.
Click to expand...

From my understanding the 110gph 14 psi pump has a max psi pressure of 14 psi... so it will flow 110gph+ from free flow ( 0 psi ) all the way to 14 psi and after that it starts to drop off in gph because of restrictions. So plugging the over flow valve would end up hurting something i would think.(?)

Adam M.
 
I run the stock pump into the stock inlet. It supplies about 20psi at idle, 28-30 at 1800rpm. I also have a 180 gph 45psi FASS pump plumbed into the front of the pump. I only use the FASS when i need to. I would not recommend having only the electric pump. I only get a few monts of continuous use out of an electric pump, but used only when needed, they should last several years.
 
turboman1 said:
From my understanding the 110gph 14 psi pump has a max psi pressure of 14 psi... so it will flow 110gph+ from free flow ( 0 psi ) all the way to 14 psi and after that it starts to drop off in gph because of restrictions. So plugging the over flow valve would end up hurting something i would think.(?)

Adam M.
Click to expand...

IMO if you stray to far from factory design your going to find IP failure, thier made to see a min. amount of fuel pressure for a reason. Just the 14psi and 110gph wont get it done, again IMO. Psi is Psi, when I added the elect. pump to the syatem it added exactly the pressure that the pump put out on the bench when I was done with adj. the relieve valve. Id retain the mech. pump and add a smaller elect. "or" if you want just and elect. pump find one that does 40-50 psi.
 
RonA said:
I run the stock pump into the stock inlet. It supplies about 20psi at idle, 28-30 at 1800rpm. I also have a 180 gph 45psi FASS pump plumbed into the front of the pump. I only use the FASS when i need to. I would not recommend having only the electric pump. I only get a few monts of continuous use out of an electric pump, but used only when needed, they should last several years.
Click to expand...

My setup works and supports a lot of power but I think I like your system of feeding the pump better. Let the stocker feed in the factory location and let the secondary pump feed the other... my try that approch some day. Ryan
 
turboman1 said:
Talked to another guy today that has run the 110gph at 14psi pump on a 03 common rail around 700 hp and he said it never dropped below 14 psi... So we went ahead and got the 110gph @ 14psi pump and will see how it does.
Click to expand...

Well to be blunt, I do see something wrong with your reasoning. You are comparing a CR truck to a p-pump truck. Totally different IPs. The p-pump was designed for high inlet pressure. It expects 35-40 psi stock if I remember right. CP3s and VPs are designed for inlet pressures around 15 psi. The pump takes x amount of fuel at x pressure and increases it to whatever the injection pressure is which is all dependent on what the IP was originally designed for.
 
turboman1 said:
What I calculated was gallons of fuel a 750 hp truck uses per hour. That is the truck is making a constant 750 hp the whole hour.
Click to expand...

you calculated what got injected into the cyl's

what about the fuel that the injectors didnt use?

that and as mentioned the fuel that went thru the pump and back to the tank for cooling
 
turboman1 said:
Ok lets assume a BSFC of .44 lb/(hp*hr)

.44 lb/(hp*hr) * 750 hp = 330lb/hr

330lb/hr * 1gallon/7.5lb = 44gallons/hr is how much fuel is flowing through the motor at max hp.

Why do I need 180gph at 45psi? = $500

What is wrong with 110gph pump at 14psi... it looks like I am never going to exceed 110gph so the pump should never drop below 14psi. = $130

Is this math all wrong?

Thanks
Adam M.
Click to expand...

well seems to me you allready have the answer you want , so why ask for advice.
 
i am curious if he is gonna shoot for 800 with the stock turbo

that would have to sound pretty wild huh?
 
Ryan,

So you run an electric pump in series with the mechanical pump to ultimately compound the fuel pressure?

How much psi are you running max?

Thanks for the help
Adam M.
 
i have heard talk of running 100+ but have also heard that there are seals that dont like more than around 50

my truck didnt seem to run any different at 10 psi than it did at 45 but the pump heads in here suggested that its hard on the pump with anything less than stock pressure

ryan already posted what his made stock

i still want to build a system around a stock pump one day, just to see how much you can get out of one
 
turboman1 said:
Ryan,

So you run an electric pump in series with the mechanical pump to ultimately compound the fuel pressure?

How much psi are you running max?

Thanks for the help
Adam M.
Click to expand...

Yes I run them in series to compound the pressure is it a good idea....I dont know, its just what I did when I built the truck and its worked ever since, many hundred passes in the 6's with this set up, and a few more tonight. I set the OFV spring up at 20mm this gave me 55psi at idle and burys the 60# gauge down track........Ryan
 
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