Dual pump set up with DW400 pump

[olaosunt]

Since when does whipple not included the pumps?
Not that I am in the market but the information had not changed on their website or if you go to order the kit from any of the usual vendors.

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[Tommy V]

Even with check valve you will lose your fuel pressure after sitting over night.The fuel still bleeds down past the regulator.I did not use a check valve and had no starting issues over the summer.

 

[Burkey]

Even with check valve you will lose your fuel pressure after sitting over night.The fuel still bleeds down past the regulator.I did not use a check valve and had no starting issues over the summer.

Which blower are you using?

 

[gimmie11s]

Good info in here.

 

[olaosunt]

Thanks again guys.
I reached out to vendor(I am not sure he can be named ) as recommended and he has been super helpful. He is putting together a kit for me and will deduct the cost of the GT 350 fuel assembly since I will be modifying mine. I will be swapping the stock pumps for dual DW400's. I happen to have a couple of "spares" I bought when I thought the one in my 18 had died as could not get the car to start. Turns out it was the battery, lol

I think I will also hit him up when I decide to go return on my 18/whipple . I am currently running a BAP with the DW400 included with the stage 2 kit and I think I am on the edge with the car making 830 whp(3.625 pulley) on E85/ID 1050x. It was starting to go lean after 7600. I will probably just run race gas till then. I think it will make similar power with MS109 tune as the timing is about the same , I could even pulley down to a 3.5 pulley with race gas for now(and have enough fuel for E85 once I go return)…. and will be able to reuse the DW400 in the GT 350 hat(No waste or having to sell used parts for peanuts lol)
Heck I could even reuse the BAP on the pumps if I needed. LOL

 

[Tommy V]

Which blower are you using?

D1sc.

 

[Burkey]

D1sc.

Stock fuel rails?

 

[Tommy V]

Yea stock rails.

 

[Toy Cobra]

I have a DW400 and a D1x on my 18 and don’t have starting problems either.

 

[TX-Ripper]

Dw can fit your DW400’s with internal check valves.

They also sell DW400’s with check valves now.

 

[olaosunt]

Dw can fit your DW400’s with internal check valves.

They also sell DW400’s with check valves now.

Nice to know that . I assume you will have to call them .
Was there any advantage to not having a check valve ?

 

[TX-Ripper]

Nice to know that . I assume you will have to call them .
Was there any advantage to not having a check valve ?

5-7% more flow

 

[olaosunt]

I think I will keep the flow .
You can prime the pumps by pressing/cycling the start button 2-3 times before you start the car.
Seems to help

 

[Jay-rod427]

I think just unlocking/opening the door primes the fuel pump once already.

 

[TX-Ripper]

I think I will keep the flow .
You can prime the pumps by pressing/cycling the start button 2-3 times before you start the car.
Seems to help

Dw says an external check even at -6 or -8 will decrease flow by 3-5%

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