New Drop In E85 Compatible Fuel Pump, DW300, January 2011

Tom, I'll call tomorrow and post my findings...
-Dan

Dividing the pump supply of 370 L/hr by 3.8, I get 97 gal/hr. Using roughly 6 lbs/gal for gas, I get 582 lb/hr, yet it is still more than the injector demand of 480 #/hr. Should be ok.

Filter reaseach

Dan:
Thanks.
It's due to people like you, that are willing to go to the extra time and effort to share their info that makes a site like this so valuable.

When you get near the limits of a pump the injectors will have to work harder. If the fuel pressure can't be maintained at WOT and in closed loop, the duty cycle will increase. If you are already operating at or near the physical limits of any component in your system, there is a chance that there could be serious consequences.

Ok as per Weldon and injected engine is best operated with a 10 micron filter pre injectors being that the basket filter inside most injectors is a 10 micron as well so... a 10 micron post pump and pre injector will keep injectors free flowing and the basket filters cleaner for much longer extending service life and keeping flow at the injectors rated spec...

As tom stated a few posts back anything less for a final filter will but to use and eventually fill the injectors (basket filters)

As far as paper filters and E-85 go, sitting idle in the filter element and non use is the biggest killer from the water absorbing properties of E-85 but with frequent use and a routine maint running a 10 micron paper filter is fine...

It's actually the water (moisture) that causes the problem,not the ethanol itself...

This is also the case with a stainless steel type mesh as well...

I mentioned service intervals in this type of situation and was told maybe 2 elements a summer or if a daily drive and very frequent use...1 filter a summer(based on a Minnesota car driving typically from May to October...

This is only an estimate of filter life!!! Every one's habits, fuel fills, and idea of routine maintenance varies!!!

I have no problem doing a once a month visual inspection, but that's me

-Dan

If you will notice that the injector demand of 480 lb/hr represents 6 of 80#/hr injectors at 100% duty cycle (so duty cycle can't increase any more, it's the worst case) and is less than the pump's supply of 580 lb/hr (by 100 lb/hr or almost 20% margin) then you will realize that the fuel pressure will be maintained.

I should have not replied with a quote from a pump when referring to injectors. I don't have a problem with your math or reasoning if all proves out. I should have stated that up front. If you assume the 18 volt delivery rate and it proves out not just initially, but over time, then I am happy for you. Good luck. I would like to discourage overly optomistic thinking. It sometimes can be dissapointing in the end.

Does anyone know for sure if dual DW 300-1 pumps can be run without a in-line check valve? I don't know if the DW pumps have a check valve built in. Thanks for any info!!

I ran a single DW301 for a few weeks with nothing in line but the filter. I assume it had a built in check valve or it would not hold fuel pressure with key on after the pump shut off. I don't think dual DW301's will fit through the hole in the gas tank?

All of the DW pumps (DW300, DW200, DW65c) have a built in check valve.

Something of interest ...
E85 Certified 416 LPH Fuel Pump (ETA May/June 2012)

• Outperforms all current market in-tank fuel pumps
• Designed for engines with more than 500 HP
• Award-winning OE technology
• High-pressure, high-flow performance
• OEM technology designed and developed for E85
• All pumping components have been validated to OEM specifications for approved use in E85/flex fuel applications

http://www.racetronix.biz/itemdesc.asp?ic=F90000267&eq=&Tp=

Wow, that's a ton of flow! Should be an awesome pump. Looks like a turbine? 120 gph down low will be an issue for stock return system/regulator unless some sort of controller is used to slow it down when not really needed.

There is a TCD300 pump available right now on ebay (probably a stock listing) for Subarus that is the same shape as the one above and has similar flow but slightly lower. F90000262 is the TI Automotive part number. It is a different model since the one above is F90000267. What is the difference other than flow, E85 compatibility?

watching..