you can set the pump2 settings earlier for a secondary additional shot of fuel but it sounds like you are near max anyways, which indicates the injectors are opening far more than they really should need to be. that is usually the case when fuel volume statically is low and cannot keep up with the immediate requirements.

you can also try pinching the return line a bit and see it that makes a difference. if it does not then i would be having a hard look at the injectors themselves and how they are wired.

another avenue to take is to set the injector staging RPM and load below your idle readings so all 4 injectors are running and see if tuning it that way makes more of a difference.

yeah, i'm sure some regulators seal backflow better than others. i know the stock FPR(case i mentioned) will allow a small amount of fuel to flow in reverse, the dribble was enough to run through the injectors with the engine's vacuum pulling it through them. the car however was undrivable in that state.

I'm am going to swap my injectors and see if that fixes anything , with the theory of a clogged injector (since my primary and secondary are the same).

The afrs Jump heavily for Maybe Half A second at most , I'm not completely sure of the exact times.

I did previously kill an injector running low on gas, and I've replaced that set of primaries, maybe the fuel pump got damaged ?

My friend helping me might be providing me with a Bosch 044 pump and aelromotive fpr to see if it fixes the problems if nothing else does.

Someone said it could also be an issue with low power to the injectors, I'm going to check that as well.

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Also I will note that all these problems have seemingly developed after I ran low on gas and had a 725cc injector get fried as the car stalled out idling (I immediately shut it off).

Afterwords I cleaned the tank, blew out the lines with compressed air, replaced the primaries with 1000cc primaries, replaced the fuel pump strainer, and replaced the oem fuel filter.

how did you fry the injector? running low on gas won't kill an injector. if you were running some cheap chinese smartfire or TRE performance injectors though, you mighta cooked the ECU.

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Injector dynamics , nothing cheap.

Pretty sure when I ran low something got sucked up from the bottom of the tank , I should of cleaned it but didn't , there was quite a bit of nasty stuff in it when I cleaned it.

ok then, it was just clogged with junk, but you replaced it or cleaned it?

If you suspect junk in the tank, then at that point the whole fuel system needs to be inspected.

Do you not have any spare injectors, even stock injectors or from another car, that you can test with?

I wouldn't assume a power problem to the injectors unless there was a specific reason to do so. The Microtech just powers the injectors from switched 12V.

I've cleaned the entire tank and blew out the lines with compressed air, unless something is still stuck somewhere or an injector is clogged idk what could be the cause.

I don't have any spare injectors :(

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Is there any good way to check everything ? I'm really not sure where to even start

I'm wondering if I should just swap another pump in and see if it fixes the issue.

I haven't taken the injectors out and physically inspected them yet

well, you could do a static volume test which would be strapping the injectors to the rails, turning on the pump and then apply 12v and ground to the injectors for 15seconds-1 minute and calculate the collected volume to a cc/min equivalent.

1000cc doesn't sound like much, until you actually need something to collect that much fuel for measurement so for 800+CC injectors i just do 30 second volume tests. the 2000cc injector flow tests can get a little messy.

I tried running the car in non staged mode today , with all injectors running (even at idle), i had to set the mix trim higher to compensate, this all resulted in a less noticeable problem with the lean spike, it was there but quite more subtle.

I am likely going to buy another fuel pump and see if my fuel pump is infact the culprit, looking into something 300lph or higher, was looking at a bosch 044 , aem 380 lph also, both of which will require some modifications and an fittings to work.

I'm wondering if it's possible my fuel pump is just not pushing the volume it should, it's really the only thing other then my injectors/fuel rail/fpr that could be the issue, i figured this would be the first thing to try replacing, especially with it being a cheap walbro 255, i checked injector voltage and fuel pump voltage, both of which had battery voltage.

This pump is major overkill, but I know if my pump was the issue, this will definitely resolve any volume issues. Just not sure how good aem is for fuel pumps, the bosch 044 flows 300 lph which isnt that much higher then the walbro http://www.ebay.com/itm/AEM-NEW-380L...NWSs1r&vxp=mtr

Then there is also the stealth aeromotive pump, but to me that just looks like a walbro 255 with higher output.

Certainly trying another pump (any pump...a spare stock pump if you have it) would be quick thing to test.

Haven't figured out what pump I want to get yet , certainly a 380 lph pump is major overkill on a car that will be 280-320 whp, im just not sure what exactly I want to get, very indecisive at this point...not sure how well an aem pump will hold up, it certainly flows very well according to their flow charts without a check valve it flows near 400lph.

Do I need a check valve for my pump if I'm running an adjustable fpr? I figured that has a check valve in it.

Just purchased an aeromotive 340lph stealth pump, flow definitely wont be an issue with this pump, now another thing i am probably going to do is take apart my FPR and see if its possible something is stuck in that, and check my injectors and see if theres a piece/chunk of rust stuck in the top of them restricting flow.

Something is definitely restricted somewhere, something is limiting my fuel flow...just need to figure out what.

A lean spike is normal if your acceleration enrichment(tip in) isnt set correct. your timing also jumps from 5 degrees to 20 degrees.

pretty sure he has already tried the common tip in enrichments we mentioned and the changes are still not reflecting it.

It's the instant fuel volume isn't there, doesn't matter how you set up the fuel map/pump settings , the only bandaid is too enrich the entire map across the board and that results in an extremely rich idle and extremely rich afrs everywhere...the map is already rich as it is...fuel isn't flowing like it should...I can't even get the car to idle past 12.5-12.8 afr without having issues of stalling.

I should be able to get it to idle in the 14s with adjustment

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Go to start the car today and it's doing the same thing it did when I ran low on gas (won't start , tries to but only slightly fires), except this time I never ran low...all I did was oil up and install a k&n air filter.

I received my Aeromotive pump, install that and now it's struggling even more and hardly at all wants to try firing.

I took off the injectors to see if there was anything in the filters and there was nothing, I also checked resistance and that was fine at around 12.5 or so on both primaries.

As a note , I did make a mistake installing the Aeromotive pump as I blocked the purge valve and caused 0 fuel pressure and tried to start it a few times due to no instructions coming with pump (looks like a customer return because sealing label was broken and tape was used to close box).

After unblocking that it still seems like it's even worse then it was before and now hardly wants to start even at all, and my fuel pressure drops a good bit after the car is shutoff. From like 40 to 30 in just a few minutes.

if you want to have the injectors flow tested i can verify the injectors are the cause or not.

I'm trying to figure out a way to test them while they're on the fuel rail without making gas go everywhere lol.

yeah it can be a pain, can wrap some glass containers so they won't break.

What do you mean ? All this just seems so weird.

Would my injectors be pushing more fuel out because if the higher flowing pump ? Maybe I need less fuel pressure. Also going to try with my old air filter , seems weird to think I'm not getting enough air but that is the only thing I changed before it starting acting weird

i mean trying to see your spray patterns and or measuring some sort of volume from them.

try it without a filter, maybe you're being overly aggressive about your oil and it is choking the engine. i have seen that before too.

Going to try lowering fuel pressure some and removing the air filter tommorow.

I also just ordered an aeromotive inline fuel filter with 6an fittings and 10 micron filter , will install that later on, ,I figured it probably flows and filters much more then the stock filter, premix probably also makes the stock filter not last as long.