The reason for the issue at around 5500 to 6000 is becuase I can't add any more duty cycle to the injector with the map as they are maxed out and that is the reason it is steadily going leaner in correlation to RPM out to redline. The 2nd pump is coming on at around 5 pounds with the provided Hobbs switch that was provided with the dual pump hanger from Full-Blown.

The Full-Blown kit didn't come with any fittings or anything and the customer is using the stock lines from the pump to the rail and from the FPR to the tank. We sourced all barb fittings and 5/16" fuel line for the feed and siphon from the passenger side tank. Also the pumpgs don't sit up in the dual hanger like stock where it is up against the housing where the pump nipple sits in the female housing of the stock hanger. It requires the need for more fittings and fuel line to place the pumps at the bottom of the hanger so they sit just as low as the factory pump would have it, measured and checked many times.....did this same thing for the return T fitting for the siphon and return from the FPR to make sure they were as low in the tank as factory.

Reason I don't think it was bypassing the pumps in the beginning of tuning 91 is because the IPW's I was commanding in the 91 tune that tuned out great with 11.3 afr's; this was the same tune put back in when we switched it back from E85 to 91 octane and now the same IPW's gave me 16's for afr's. It vary well could be something in the pump assembly that went wrong, but it also could be the FPR which is what I'm gonna test next; then go back to digging at the dual pump setup again for anything out of the ordinary if the FPR doesn't fix it.

 

Let us know if you find a fix please.. My next step is to just add more fuel through the fpr. I know its just a band aid fix but i dont know what else to do..
thanks!

 

Will do....if it is the FPR the customer is going to switch to an Aeromotive universal unit and AMS fuel rail as well....I'm sure the stock fpr and rail would do just fine he would just like to upgrade.

 

Ok, so the FPR did not fix the problem. We're going to try to mess with the pumps tonight..

Razorlab so far all you have done is been a smarta$$. If your looking for drama go to the theatre, because your not any help here.

 

Just throwing it out there..... It sounds like this is a fuel delivery issue for sure, you said you checked the pumps, changed the regulator rail, etc.... since the tune worked before and now doesn't is seems the only likely things to replace are thing which can fail aka regulator/pumps.... or clogging issues aka the rail, lines or injectors....... if it were me, I would try back flushing the fuel injectors. It is very likely that since you are not running a filter small particles can get inside your injectors and hinder flow. What I have done in the past is get a spray can of B12, or any pressurized fuel system cleaner. Find a piece of fuel hose that fits over the output side of the fuel injector then somehow build up the diameter of the red spray tube that comes with the cleaner to fit tight in the fuel line. (I used a lathe made piece to fit tight on the injector and tight on the tube) then apply 12v to the injector low current, I used a 12v 1amp battery charger....... spray the cleaner in reverse through the injector...... if you do it over a white paper towel you will be amazed at all the junk that will come out! Repeat till your towel is clean. Note Do Not hold the injector on for more than about 30-45 seconds at a time.... It usually helps to have an assistant b/c holding it all together gets to be a bit tricky and I definitely recommend wearing a face shield.... if a line leaks and sprays you in the face IT BURNS A LOT!

 

We're using an inline filter and the injectors were just put in b4 tuning began.......

 

Oh ok, I missed the inline filter.........

I have seen injectors get clogged on just one or two runs. Its possible that you had a deposit somewhere in a line and when you put the e85 it made the deposit go into solution and clog up....... Worth checking IMO

keep us posted of what the cause is.

 

Is this a joke? Are you for real? Really? Let me quote all my questions and suggestions I had in this thread.


All the same questions and suggestions everyone else is inputting in this thread. So I guess everyone sucks.

I guess I will think twice before trying to help people now...

 

Wow, just wow.

KCevo-

Anyway so have you checked the voltage at the pump to make sure its not dropping way off? I am thinking that since this was fine beforehand, then switched, and switched back yet again and then still lean that something either in the feed or voltage is whack.

Those use a relay to maintain voltage right? Maybe a burnt out relay? Have you pulled the pumps to make sure that both are purring? I think when you get it everyone will end up doing the "oh yeah of course" thing.

 

We're pulling the pumps as we speak. We're going to check the voltage. Thanks. I'll fill u in asap.

 

I do appreciate help, but I don't appreciate comments like this one and having to repeat what has already been stated multiple times. It clutters up the thread.

But back on topic, i think we may do away with the hobbs switch and drill out the tee fitting.

 

Is it possible to check the function of the hobs switch? Im going to say it again.......if it worked before it should work again, there must be a clog or a failure......

 

Good luck with the problem.

 

Are you still running stock lines?? That could be a restriction?? I would look into do at least -6 an line. Just a thought.

 

Your right....sorry about that.

I thought i clicked paged 1 & I scrolled up.....I saw your post on top of page 2, thinking it was page 1....yeah, maybe i ought to try this new thing called READING

sorry bro btw, i havent had / made the time to try your suggestion....thanks