fuel filter trouble

[pimpy rider]

i finally got everything sorted in my awd colt, so i decided to start turning up the boost. as soon as i hit 13 psi it went lean, 11.5 to 1. i believe this is lack of fuel flow causing this issue.
this car would have no trouble boosting to 15 psi before, it actually had no filter(i didnt build this car initially).
i installed a stock style filter when i awd swapped it.
the funny thing is, and the reason i made a thread, is my other colt was having the same problems. the fuel supply was inadequate at 10 psi boost, brand new filter too, i replaced it with another new filter, different part number, and its fine now

i used to make 350plus hp with a stock filter/line setup and ran 11.8. i just dont get what is going on here. why are these filters so restrictive? i can barely blow through them

 

[pauleyman]

Maybe your tank is filthy

 

[pimpy rider]

it cant be that, i put 10000 plus kms+ on this thing with no fuel filter at all. i think whoever is making these filters is making them more restrictive then they used to. i will swap it out with a new one, just to be sure. and i will install my temporary pressure guage and watch it while i do a pull. my guess is both of these filters came fron the same batch, but nobody else seems to be having this problem...

 

[spyderdrifter]

Not to be offensive, but to think that the companies make the parts restrictive on purpose is a very naive thing to assume. Sadly, bad parts do make it past quality control, but not very often. On cars as old as the ones we all here love, I'd believe more that the problem originates with parts already installed such as a clog.

Also, don't run without the filter...

 

[pimpy rider]

no offense taken, you dont know me. its not a clog.
the simplest answer is usually the correct one.
it worked fine with no filter
installed filter now i dont have enough fuel
the filter will slow your fuel supply,thats a given. these filters are very hard to blow through. i dont recall if they were always this way

 

[mustracetsi]

I don't know much about fuel delivery. You went from non filter to filter. You say is restrictive. Go with an aftermarket one or higher flow one. Previously posted the tank could have contaminates thats clogging the filter. It maybe slightly restrictive like you say but the car was non filtered maybe have to adjust fuel pressure or your tune when putting the filter.

 

[bmxfelon420]

Does the colt have banjo bolts on either side of the filter? I'd replace anything with straight fittings instead if you can.

 

[jon2manyrides]

Correct me if I'm wrong which I'm pretty sure I'm not 14.7 is stoch... anything above that is lean let's say example 17.1 and rich is anything below that like your 11.what ever... its broken down by how many parts of fuel/ air so your saying 11.7 that's 11 parts fuel to one part air (rich) which is really if you read thru tuning forms is where you should be running at ... I think your real problem is your hitting fuel cut thru the ecm... also the restrictive nature of the fuel filters is because they are made to catch stuff the human eye has a vary hard time seeing go to the auto parts store and test my theories have them pull as many filters as they have in stock and blow thru them all... also have to keep in mind that it most likely is a paper filter... cut one open and I'm pretty sure actually I'd put money on it that's it has a form of a paper filter... yes a clogged fuel line is likely depending on history of the vehical but doubt it.... another possible situation is fuel line is bent or kinked or pinched somewhere.... I'm putting money on fuel cut though ecm is seeing to much boost and cutting your fuel turn boost down just a hair at a time WITH fuel filter installed correctly and I bet you find a point where problems just go away only down side less boost means less fun... get a data logger to see what's actually happening

 

[jon2manyrides]

If it was 1.1 you would have one part fuel to one part air the closer the numbers get the richer my ride will spit black smoke at 10.5to 1 and back fire if its over 14.7 to 1 so be care full when playing with fuel don't want to melt down a good motor also another way for sure to tell is drive it for a little while and pull the spark plugs see how they look and Google will be your best friend

 

[pimpy rider]

guys i have a wideband? how do you think i know what my ratio is?
my car is running a maf translator, stock ecu, stock injectors
it runs 10-1 at wot, very safe setting
stock 1g dsm run 9.5 to 1 wot

anyways i put on my temporary fuel pressure guage and just like i knew it would, it drops pressure at 10 psi.
removed fuel filter
it is NOT PLUGGED
i am more than happy to cut one up for research purposes, i have 3 pretty much new used ones now
the car has a walbro 190 btw

why am i the only one with this problem?
i have used these same jobber filters and 190 pumps and had no issue running 25 psi boost

maybe i should try the dealer?

 

[jon2manyrides]

Try a different brand lik wix or fleet guard or fram or try adjusting you pressure to compensate

 

[pimpy rider]

i installed a filter that is for a dodge caravan, there was three of them on the shelf, they are the cheapest efi filter i saw, and it is 5/16 hose in/out, so i had to cut my lines to install it. the lower line was already cut from pevious owner and i have a few spare upper lines, so no big deal.
i lost the ability to install my fuel pressure guage, cause it uses a modified banjo
now i have a much better flowing (by blow through method) filter and no more banjo bolt

its still going lean up top. should be 10 to 1 but its going up to 12, so im assuming the pressure is still tapering

must not be the filter
ill swap out the pump now, has to be what it is

 

[pimpy rider]

i discovered the real issue here. i removed the pump assembly, made a makeshift pump tester where i hotwire the pump to empty a pail of gas and compare to other pumps i have laying around. a stock denso pump i have did 18 seconds. the 190 from this car did 14 and the 255 i have did 11. so then my next suspicion was fuel getting past the o ring, sure enough.
when assembled the whole pump in the pump holder, and hooked it up to my fuel pressure guage, it leaks past the o ring real bad.
unfortunately this is not a dsm so i cant just cut the line and install a rubber hose, i will have to try to find a tighter fitting o ring. its a very low tank, very tight for space.

only reason i ever suspected filter was because i had filter issues on my other car, and the addition of the filter did kill my flow seriously