2G Testing fuel pressure regulator

[Spln_Hrd]

i think my fpr might be bad, how can i test this and if it turns out to be my fpr i would like to upgrade it so i would like to know some recomendations

my only fuel mod is a rewired 190 lph fp but i am planning on bumping up to some 650+ injectors

price and quality are equal roles in my choice i am going to college right now so my budget is super small

 

[Spln_Hrd]

got everyone stumped?

 

[David15151]

how about.. stick a guage on it and see what it reads?

 

[David15151]

a rewired 190 will overrun the stock fpr anyways.

 

[Spln_Hrd]

well i think i am loosing fuel pressure slowly when the car sits

when it is cold and i start it, it starts like shiat but if i turn the key to the on position and back 3 times and let it sit for like 5 seconds each time it starts fine so i am thinking my fpr is leaking the pressure or an injector is.

 

[David15151]

stick a guage on it and see what it reads.. good way to start seeing what the problem is. those things cant be more than 20 bucks... for a normal one.

 

[99gst_racer]

well i think i am loosing fuel pressure slowly when the car sits

when it is cold and i start it, it starts like shiat but if i turn the key to the on position and back 3 times and let it sit for like 5 seconds each time it starts fine so i am thinking my fpr is leaking the pressure or an injector is.

^^^^ My car does this too. I have yet to explore the reasons for this though....
By a fuel pressure gauge and stick it on the top of the fuel filter. Than post your results. Like I said, my car is doing the same thing, but I know for a fact it is not my fuel pressure. I have a Walbro 225, AFPR, and a gauge on the regulator. My fuel pressure is always consistent.

 

[Spln_Hrd]

well i am kinda to poor to go buy one unless i need it i only have like 100 bucks to spend on my car and if its an injector i would be really sad if i baught that gauge for no reason

 

[99gst_racer]

well i am kinda to poor to go buy one unless i need it i only have like 100 bucks to spend on my car and if its an injector i would be really sad if i baught that gauge for no reason

A fuel pressure gauge is just a good gauge to have, period. If you got one, it would not be "for no reason". They are cheap too. PM me. I got one for $26 brand neww and it comes with all the fittings you need.

 

[David15151]

paul you are like a damn street salesmen. oh you need that? no problem i got that right here.. as he pulls it out of his coat.

 

[dave99gst]

a rewired 190 will overrun the stock fpr anyways.

not really.

id go with a spoolin up FPR ( or what ever there new name is-- rev hard? )

 

[99gst_racer]

paul you are like a damn street salesmen. oh you need that? no problem i got that right here.. as he pulls it out of his coat.

:laugh:

Hey, just trying to help out my fellow DSMers. I should be a Vendor.

 

[David15151]

not really.

id go with a spoolin up FPR ( or what ever there new name is-- rev hard? )

full throttle speed ?

 

[Spln_Hrd]

i would defenatly be interested in the gauge if i am going to get a aftermarket fpr

how can i test my injectors i have a datalogger will that help? i also have a hks super afr and i have leaned it out about 4 % across the board and my car runs between .98-1.04 i cannot lean out my car, it backfires like fuel cut after i am in it for a little while i don't know what is wrong i and would like some help

my car starts funny when its cold it runs tooooo rich and i don't know if i should try leaning it out more with my afr or what. i don't know what my fuel trims should look like i don't know what my mafs should be reading for lb/min and everytime i ask no one answeres. it doesn't pull like it should except in first, the higher the gear the more shitty it runs it shoots out clouds of black smoke.

 

[dave99gst]

only testing you can do is have them flow tested.

 

[Mike000]

Who put your fuel pump in? I wonder if its this.

From vfaq.

Be careful when putting the pump up into the fuel feed line - the rubber O-ring should be lubed with some grease, oil, or spit (hey, it works) so that the O-ring slips easily into the feed line. If it does not, the O-ring can kink or tear, and the car will be hard to start after sitting a few minutes, as the kinked/torn O-ring will allow the fuel to bleed out of the feed lines. The symptom will be that the car will take several seconds to start after sitting more than a minute or 2, but starts right up if you turn it off and then immediately start it back up.

 

[el aguila]

Who put your fuel pump in? I wonder if its this.

From vfaq.

Be careful when putting the pump up into the fuel feed line - the rubber O-ring should be lubed with some grease, oil, or spit (hey, it works) so that the O-ring slips easily into the feed line. If it does not, the O-ring can kink or tear, and the car will be hard to start after sitting a few minutes, as the kinked/torn O-ring will allow the fuel to bleed out of the feed lines. The symptom will be that the car will take several seconds to start after sitting more than a minute or 2, but starts right up if you turn it off and then immediately start it back up.

^ Ditto. If you've replaced your pump recently, that is MOST LIKELY your problem.

As for testing your injectors, only way is to put them on a flowbench. You can also check the resistance of them (2-3 ohms). As for fuel pressure, easiest way is to get a cheap gauge from summit or go to a shop where they will hook up a gauge adapter to the fuel filter outlet since DSMs have no schrader valve on the fuel rail. Watch the pressure at idle, it should be around 27-32, and then disconnect the vac hose from the regulator (plug the hose when doing this) and you can watch your pressure jump to 38-40 or so.

 

[el aguila]

well i think i am loosing fuel pressure slowly when the car sits

when it is cold and i start it, it starts like shiat but if i turn the key to the on position and back 3 times and let it sit for like 5 seconds each time it starts fine so i am thinking my fpr is leaking the pressure or an injector is.

Also the reason for that is when the key is turned to "on", the pump is primed.