Fuel Issues Blues..

[Foose04]

Well i'm still working on this issue. Started with the walbro 400's dying because of e85. Next I have 450's rated for e85, but still well short on fuel compared to what I used to have on my setup.

I ordered a Autometer 0-100 psi sensor to log pressure and new fuel filter.

The fuel filer was (4+ years old) , would this be enough to cause lean out up top? It's a Jegs 5" filter, rater at 1000HP for alcohol. 100 Micron.

Next up is remove the KB boost a pump to see if it's not feeding these 450 properly. Thoughts?

I tried base FP from 55psi to 70psi, all seems bring the same results, 100 duty cycle and lean she goes above 5k.

[WTFWSAT]

Could the injectors be dirty? Fwiw i run a 100mic filter pre pump and a 10mic post. Your filter does look a little dirty, it could be the issue.

[Qwik_Sn95]

Originally Posted by WTFWSAT

Could the injectors be dirty? Fwiw i run a 100mic filter pre pump and a 10mic post. Your filter does look a little dirty, it could be the issue.

Same on my setup. If your just running a 100 after the pumps its possible you have trash in the injectors. I'd run a 10 micron after the pumps befjr the rails. Theres a thread on the bullet recently that ended up being dirty injectors after changing all kinds of stuff. Also with that much pump what's the point in the boostapump?

[DolSVT00]

Find trash can, throw boost a shit in it.

Its astounding how many engine's that garbage has hurt. Yet people still buy them.

I cant say enough how much I hate those things.

[ElecTech]

Rob,

Are you running a hotwire kit?

[Foose04]

There's really no reason for KB at this point. I tested it by hitting the Hobbs switch with air and my base fuel pressure jumps about 15 psi when it's active but I have no idea how it acts under wot.

I'll try the filter tomorrow and disconnect/straight feed the pumps of the battery. See what happens.

It is possible after more search my injectors are dirty as well. I'll try that as next but likely send them to be checked and suck up buying some 120s or 160s.

Thanks for the tips guys.

Originally Posted by ElecTech

Rob,

Are you running a hotwire kit?

I'm running a 10 gauge back to them, splitting to 12s inside the tank.

[ElecTech]

Originally Posted by Qwik_Sn95

Also with that much pump what's the point in the boostapump?

It will stabilize the voltage to the pumps. It will provide a regulated 14V even in the "off boost" mode. That can help if you have a weak alternator or overall low sytem voltage as it will work down to 10 V.

Originally Posted by Foose04

I'm running a 10 gauge back to them, splitting to 12s inside the tank.

The only reason I ask is if you are using the alternator as your source, log your system voltage in HPT and see that it is holding a steady voltage under heavy acceleration. I ran into this with my truck knowing I had enough injector and should have had enough pump and found that the alternator would drop out under hard acceleration and the voltage would drop to 10.9 V causing the pump output to drop dramaticly.

It is something to check but now I realize you are on 80's, i think that is your issue.

What rail pressure are you running?

[ElecTech]

Those pumps will deliver 100 psi capacity, but the 400lph is @ 40psi so if you start at a 50 psi base pressure, with 20 psi boost you have an effective pressure of 70 psi. More pressure to compensate for those injectors will only make the situation worse as pump flow drops as the pressure goes up.

calculated estimations put you needing about a 105 lb per hour based on the last dyno graph I saw for your truck. I think things have changed since then so i would say it's time to step up.

[Carlrx7]

A) injectors too small
B) dropping fuel pressure

Duct tape a rental FP gauge to the windshield.

Surprised your injectors have lasted this long @ 100% duty cycle.. ID1000's flow 127# at 4 bar, get them.

-Carl

[Foose04]

Snow ball chance, any where local that can flow/clean my 80s?

Might give these guys a call tomorrow. It's only money... God bless.

http://fuelinjectorconnection.com/sh...p?productid=11

[djfury05]

Originally Posted by Foose04

Snow ball chance, any where local that can flow/clean my 80s?

Might give these guys a call tomorrow. It's only money... God bless.

http://fuelinjectorconnection.com/sh...p?productid=11

Lashway Motorsports in Florida can do the same stuff for $80.. I'm about to send a set in soon.. I too thought $18.50 per injector from FIC was ridiculous

[slowgreen99]

Filters are over rated

[oldskoolstang]

I would look into getting some 120s or 160s. 80s seem to small to me with e85 at your power level.....

[spdracr0]

e85 will f up filters in a heartbeat. You got plenty of pump.

[labelblack68]

wanna sell those 80s?

[TurboWS6]

If you want to see if its the injectors

I got a set of siemens 80s out of my ride that are 8 months old and have about 500 miles on them you can swap and see the outcome, but I want them back, I am in Florence for the next few months. Ill be in the area on friday to check up on the house and sign my DD214 so we might be able to get together then. Shoot me a PM.

[djfury05]

Also, give this link a look.. its got some good info and an excel spreadsheet to input your values etc and find what "should" work for you.

http://ls1tech.com/forums/fueling-in...pump-flow.html

[WTFWSAT]

I had mine cleaned and flowed for $50 i believe. If youre interested ill find the info.

[1998ta__1991rs]

I've got a brand new set of 80s at the shop if you want to swap them in to check

[BAD BOB]

bigger injector