Dual pump set up with DW400 pump

[olaosunt]

Since a single pump with a returnless system is rated to support 750 whp with E85.
What if you do a dual pumpset up with 2 ?

I am wondering if replacing the dual stock pumps in my GT 350 with the DW400’s would give me enough fuel for 850 whp on E85 without having to run dual BAPS .

I don’t think converting the stock system to a return will be the answer since I hear people running out of Pump with the dual pump systems out there (GT 350 and Sai Li-GT500)
Really want to avoid doing a full return system as want to keep the car as close to stock (except for the whipple LOL)

Honestly not been too crazy about the pump in my 18/ whipple primarily because of the lack of check valve causing starting issues . I also run a JMS BAP set to 18v but I may have killed the pump as car won’t start up at all now - just cranks . I can’t hear the pump click when press the start button
I swapped the #49 fuse but still no dice .
I am assuming the pump is dead or it’s a wiring issue and not getting any current .

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[Burkey]

Since a single pump is rated to support 750 whp with E85.
What if you do a dual pump set up with 2 ?

I am wondering if replacing the dual stock pumps in my GT 350 with the DW400’s would give me enough fuel for 850 whp on E85 without having to run dual BAPS .

I don’t think converting the stock system to a return will be the answer since I hear people running out of Pump with the dual pump systems out there (GT 350 and Sai Li-GT500)
Really want to avoid doing a full return system as want to keep the car as close to stock (except for the whipple LOL)

Honestly not been too crazy about the pump in my 18/ whipple primarily because of the lack of check valve causing starting issues . I also run a JMS BAP set to 18v but I may have killed the pump as car won’t start up at all now - just cranks . I can’t hear the pump click when pres tne start button
I swapped the #49 fuse but no dice .

Pull the fuel line off at the rail. Get someone to cover the end with some rag.
Press start button. Fuel or no fuel?
My DW400 pump quit on me too. One of the electrical connectors had fallen off inside the housing.

 

[olaosunt]

Thanks . I will have to ask my installer to try that tomorrow .
There are all girls (who have zero interest in cars) in my household and I wont be able to find a “buddy” on Sunday . Lol

Did you have to replace the entire pump or just the connector?

I went ahead and ordered a new pump with the install kit .

I figure if I don’t need it I could use it with the GT 350(will need another one ) if I decided to give the dual DW400 idea a go .

What you think of running 2 of them in a stock(returnless GT 350 fuel system ?

 

[Kona 18]

You can do dual DW400 in the stock GT350 hat, they have a ton of flow to them even at higher pressures you will see due to the pressure loss across the stock lines.

Ideally you will wan to add 2 6AN bulkheads to the hat and run those to a Y block(6AN inlets with 8AN outlet) then run the 8AN to your rails, then regulator, the return port will connect to the factory 3/8th port on the hat.

You can try putting 2 DW400 in the hat and keeping it returnless, but the GT350 car itself runs PWM for the pumps, so you will need to talk with your tuner and see if they have tune it to run the pressures you need them too. Also, you won't have boost reference if you stay returnless...I would just go return style..

 

[olaosunt]

You can do dual DW400 in the stock GT350 hat, they have a ton of flow to them even at higher pressures you will see due to the pressure loss across the stock lines.

Ideally you will wan to add 2 6AN bulkheads to the hat and run those to a Y block(6AN inlets with 8AN outlet) then run the 8AN to your rails, then regulator, the return port will connect to the factory 3/8th port on the hat.

You can try putting 2 DW400 in the hat and keeping it returnless, but the GT350 car itself runs PWM for the pumps, so you will need to talk with your tuner and see if they have tune it to run the pressures you need them too. Also, you won't have boost reference if you stay returnless...I would just go return style..

Thanks a lot for your reply .

I will ask my tuner what he thinks . Sorry for the noob questions but what’s PWM ?

Do the 18-19 GT’s also run “PWM” for the pump ?

If I convert to a return system as you suggest will the Dual DW400 support more power than say the Sai Li system ?

 

[Kona 18]

Thanks a lot for you reply .

I will ask my tuner what he thinks . Sorry for the noob questions but what’s PWM ?

Do the 18-19 GT’s also run “PWM” for the pump ?

If I convert to a return system as you suggest will the Dual DW400 support more power than say the Sai Li system ?

PWM is pulsewidth modulation

Dual DW400 will flow way more fuel than the OE pumps ford uses in their hats, each DW400 flows about 80% more than each OE pump in the Ford hat, so they will support more power than its that use OE Ford pumps. If you plan to covert to return style, do it like in the pic I sent so you have less pressure drop from the stock ones, run dual out, to a Y bock, then 8AN to the rails and regulator

 

[kcc0521]

PWM is pulsewidth modulation

Dual DW400 will flow way more fuel than the OE pumps ford uses in their hats, each DW400 flows about 80% more than each OE pump in the Ford hat, so they will support more power than its that use OE Ford pumps. If you plan to covert to return style, do it like in the pic I sent so you have less pressure drop from the stock ones, run dual out, to a Y bock, then 8AN to the rails and regulator

If you go that route you might as well throw a fore hat in there. you will be at 400-500 bucks in just pumps. You can leave your stock feed line in place and everything can easily be returned to stock. I used black ptfe line on my car and the only thing that you notice is the fuel pressure regulator.

 

[Kona 18]

If you go that route you might as well throw a fore hat in there. you will be at 400-500 bucks in just pumps. You can leave your stock feed line in place and everything can easily be returned to stock. I used black ptfe line on my car and the only thing that you notice is the fuel pressure regulator.

That's what I would do, except I'd just run a radium assembly instead na d8AN to the rails and regulator, hide the regulator in the fender well and you wouldn't even know except for the braided hose feeing the stock rail

 

[olaosunt]

If you go that route you might as well throw a fore hat in there. you will be at 400-500 bucks in just pumps. You can leave your stock feed line in place and everything can easily be returned to stock. I used black ptfe line on my car and the only thing that you notice is the fuel pressure regulator.

That's what I would do, except I'd just run a radium assembly instead na d8AN to the rails and regulator, hide the regulator in the fender well and you wouldn't even know except for the braided hose feeing the stock rail

Thanks again guys.
So what is the advantage of the fore hat versus keeping the stock hat ?
Any thoughts on the Walbro "hell cat" 525 that have similar flow to the DW400's but have a check val

 

[Kona 18]

The F90000285 pumps flows like 5% less than the DW400, almost negligible for sure, but they are not set up for a stock hat, they lack the Venturi fitting to allow the factory cross hat to draw fuel from the other side of the saddle. It is a nice pump though if you toss it in a Radium or Fore hat, they do have a larger amp draw though...

 

[olaosunt]

If you go that route you might as well throw a fore hat in there. you will be at 400-500 bucks in just pumps. You can leave your stock feed line in place and everything can easily be returned to stock. I used black ptfe line on my car and the only thing that you notice is the fuel pressure regulator.

That's what I would do, except I'd just run a radium assembly instead na d8AN to the rails and regulator, hide the regulator in the fender well and you wouldn't even know except for the braided hose feeing the stock rail

Thanks again guys.
So what is the advantage of the fore hat versus keeping the stock hat other than avoiding modifying the stock one ?



If I use the fore hat may be I could just run the cheaper 465 Walbro pumps then.

Any thoughts on the "hell cat" 525 that have similar flow to the DW400's but have a check valve ?

 

[Kona 18]

Any thoughts on the "hell cat" 525 that have similar flow to the DW400's but have a check valve ?

The F90000285 is a nice pump, but the lack the additional fitting to allow the OE venturi set up to draw fuel from the other side of the saddle...only the DW400 has this fitting right now. Also, the 285 has a 22amp draw@80psi, vs the DW400's 19amps, even at 60ps it's 18amps to 20amps...the lack of check valve is no big deal, if it bothers you so much, you can add a inline check valve, but you can live with out it, even aftermarket fuel systems that use the 274 and 285 systems will have in line check valves

 

[olaosunt]

OK
I think I got this(Thanks for the schooling) except the part about the radium assembly. lol

so , If I stick to the stock hat I need to use the DW400 pump and can add an inline check valve(any links to get them?)

With the fore hat I can run the walbro pumps(like the 274's I run in the full systems in my other cars) but the 285's will have too much draw(fore says to use a secondary pump),

 

[Kona 18]

Found the video, my previous number might have been off since it was off memory

 

[2kblacksleeper]

Also please note that the DW400 has no check valve in it. You may have issues with hot starts. I know Whipple does not include this pump in their 18 Kits any longer. Since the fuel will drain all the way back to the tank. I know they are working on an updated version.

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