adequate feed for bosch 044?

[compression]

What size fuel pump would be enough to feed the 044?

The reason i am asking is because, i just spent a few hours taking my evo 8 fuel pump out of one car, and installing it into this one to feed my 044.

I'm going lean at the top end, i think the pump is not able to suck enough fuel through the sump i had welded on because no matter how much fuel i add it is still in the 13-13.5:1 area.. Maybe the sump was installed incorrectly, the hole to small, wrong area etc.

So i just put the evo 8 fuel pump in which is about 190 lph and the bosch 044 sucks more fuel then the evo 8 can deliver.

Unless my pump is just no good and isnt performing like it should. i pulled it out of a car that sat for a year.But i did soak it in gasoline and clean it really good. made sure the pump works correctly.

The evo 8 pump will push 60 psi of fuel pressure alone, but with both combined the line goes dry in between the pumps.

So did i do something wrong? or is this pump just too small to feed the monster on the other end?

There is also a 40 micron filter in between the pumps, i figured the evo 8 pump would be able to push it through that no problem.

Before the pump addition i had the filter before the 044 from the sump and it would cavitate , so maybe the filter is my problem?

 

[Funfettie]

Id run Walbro 255's. Ill be running 2 in-tank when I start up my 600whp build this spring.

 

[compression]

Yea if the conclusion is , the 190 isn't enough i will get a 255.

But the question remains, is a 190 enough or no?

 

[Spyderman7]

Can you log the voltage during your pulls and see if the voltage is droping off .IF these pumps dont have full voltage they do not peform well.
In my car I run two and dont have anything feeding either pump and the only time i really run into any problems with them is if the voltage is droping off in the upper rpm range and will cause the car to lean out pretty bad really quick

 

[dsmornothing]

You want a pump that is as equal to the 044 as possible so yes I would step it up to a 255, 190 will not supply enough fuel If the time comes where you need LOTS.

 

[compression]

So this is unrelated to the filter?

 

[greengoblin]

You do not need a pump that is as big as the 044. You have to remember that there will be almost no pressure between the feeder pump and the 044.

Here is a better explanation: Frequently Asked Questions : Jay Racing

Here is a good fuel pump read too: Stealth 316 - Fuel Pump Upgrade Guide

 

[compression]

Ok i removed the filter, it is better but still not enough. the monster of a fuel pump 044 demands more fuel then the evo 8 can deliver. might be because the line in between the pumps is -10, and the pump cant fill the large volume fast enough. i am not sure.

But i am going to purchase a 255 whenever my check finds its way into my account.

On a side note i bumped up the fuel pressure from 43 to 50 to compensate, and did not change the tune, and the car ran much better, with a max of 11.9:1 afr instead of that crazy 13.5:1.