Fuel Pressure with Dual SD Pumps - PowerStrokeNation : Ford Powerstroke Diesel Forum
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post #1 of 51 (permalink) Old 08-14-2007, 03:38 PM Thread Starter
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Fuel Pressure with Dual SD Pumps

We have a truck in the shop that has dual SD fuel pumps inline. Fuel pressure is set at 80PSI. Driving down the road in the stock setting of the chip it goes down to about 50PSI. In the 140 Setting of the chip it goes all the way down to 30PSI. The tank has been dropped, sending unit is clean. New fuel filter has been installed. For the guys that are running this setup, what kind of fuel pressure is normal? We run Aeromotives, so I am unfamiliar with this setup. When the fuel pressure drops, things get real hot, like 1400*+ truck only, and that is not good when all this truck does is pull a trailer around. I think that if we could keep the fuel pressure stabilized that maybe the temps would not rise as fast as they do. When cruising down the freeway at 70MPH, the fuel pressure stabilizes to about 75PSI and only comes down to about 65-60PSI when pulling a hill. It seems to have the biggest problem with leaving a stop sign. Any help would be great guys.
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Nate
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post #2 of 51 (permalink) Old 08-14-2007, 03:47 PM
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Re: Fuel Pressure with Dual SD Pumps

We're getting ready to install a second SD fuel pump this weekend on a truck, so results are coming.
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post #3 of 51 (permalink) Old 08-14-2007, 03:49 PM
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Re: Fuel Pressure with Dual SD Pumps

I would try and lower the base pressure and try and watch what happens then.... try 62-64 lbs base pressure.... it shouldnt need more than that... any time pressure goes up, volume goes down... so if you start with a lower base pressure it should be more stable all across the board...
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post #4 of 51 (permalink) Old 08-14-2007, 04:20 PM
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Re: Fuel Pressure with Dual SD Pumps

I may be wrong but if the pressure is dropping because of lack of flow volume having them in series is not going to help. Putting them in parallel will help keep the pressure up at high demand.
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post #5 of 51 (permalink) Old 08-14-2007, 04:28 PM Thread Starter
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Re: Fuel Pressure with Dual SD Pumps

If we ran the pumps in parallel, where would you install the supply line in the fuel filter housing?
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post #6 of 51 (permalink) Old 08-14-2007, 04:50 PM
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Re: Fuel Pressure with Dual SD Pumps

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Originally Posted by UNLIMITED_DIESEL View Post
If we ran the pumps in parallel, where would you install the supply line in the fuel filter housing?
Don't you have to ditch the fuel bowl for a dual pump set-up??

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post #7 of 51 (permalink) Old 08-14-2007, 04:56 PM
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Re: Fuel Pressure with Dual SD Pumps

Fuel supply "Y"s are available most performace shops. Aeromotive has one for $80. I got one for my bowl delete system from summit racing.com for $24. Run the two paralled lines to a Y and then the Y to the bowl. You might try drilling out the center of the 1/8" NPT fitting out to .250 like I did.

Unless I am missing something here, it is that easy.

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post #8 of 51 (permalink) Old 08-14-2007, 05:02 PM
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Re: Fuel Pressure with Dual SD Pumps

Agree with above, the pumps must be in parallel not series. In series, you only get the flow of one pump. You can "Y" them in or just put tees in the lines before and after the pumps.

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post #9 of 51 (permalink) Old 08-14-2007, 05:23 PM
 
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Re: Fuel Pressure with Dual SD Pumps

If i'm not mistaken, most people run one feeding the other ???
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post #10 of 51 (permalink) Old 08-14-2007, 05:32 PM
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Re: Fuel Pressure with Dual SD Pumps

Quote:
Originally Posted by UNLIMITED_DIESEL View Post
If we ran the pumps in parallel, where would you install the supply line in the fuel filter housing?
they wont work in parallel, one pump will starve the other pump and burn it up. I tried it quite awhile back and it was worse fuel pressure than a single stock pump. right now im running 2 stock pumps in series and it will hold 35 psi at wot with 275's. Yes i know thats not good, but it works for now.l

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