MattB

simple as that...will it? i have i feeling it does...


AND, if it does, can i run the stock pump with rtek 1.7 and 720cc secondaries? at least until my new FPR comes in? As long as i dont boost?


-Matt

SureShot

Even if it did, the fuel pressure would be above spec, not below.
Worst case, you'll run a little rich.
So in the meantime, you can drive normal.

Maybe when you get the new FPR, temporarily install it upstream of the stock FPR to check its pressure readings.

MattB

yes, i know my fuel pressure is TOO much. Its running VERY rich, and idle is rough because of it. I took pliers and squeezed the fuel line and it smoothed my idle out perfectly...

sorry i forgot to mention my car wont idle AT ALL, and is so rich my tail pipe is turning black. AND my gas mileage has gone to ****...im geting about 10mpg (on a good day)

pistonsuk

The walbro willl raise the fuel pressure on the stock regulator at idle.

I dont know anything about the rtek setup?

Justin

SureShot

I like the "pinch the hose" fuel pressure test. It's crude, but effective.

MattB

haha it seemed like a good test....and it FINALLY showed me exactly what was wrong...

would something like this be satisfactory?

http://cgi.ebay.com/ebaymotors/FUEL-...40556522QQrdZ1

MattB

Can someone translate the FSM for me...i dont really understand how that test works...if i put in a new FPR, how exactly do i adjust it? I dont have the "Multi-Pressure Tester" or is that something i could make from some fittings at Home Depot? If anyone understands it better please explain it to me.

rotorforce

I had the same setup in one of my TII's and what I did was just turn the pressure regulater set screw until my car idled to as close as stock as possible. The trcik is to get it to idle period then start your adjustments. I am not sure if there is a way to test the pressure and what the exact specs should be with the walbro pump installed. If anyone does know if there are specs on where the fuel pressure should be I'd be interested as well.

I have the aeromotive pressure regulator, and I am not sure how well the one you are interested in on ebay will work. It does shave a fuel pressure gauge on it which might help if you can get some info on where the fuel pressure should be.
You might also want to consider an air/fuel ratio gauge as well to monitor your vehicle if your going to upgrade fuel flow.

MattB

WAIT, so is the stock FPR adjustable? If it is i can just install in in-line pressure gauge...then i would be able to set it to the correct pressure...but i dont mind ordering the one off ebay if i have too...just need to know if people have noticed Walbro 255's overloading the stock one...

and the adjustments are in the FSM

with the vac line off the FPR you should get around 40 PSI....

pistonsuk

The problem with the stock one is that it cannot bypass enough flow even when it is fully open. This is a separate issue from setting the pressure.

Justin

MattB

so should i go out and buy an aftermarket one? and where do i get a fitting to go on the end of the fuel rail since it wont attach in the stock position?

rotorforce

I actually meant the aeromotive pressure regulator. Stock would be useless at this point...

drago86

That maybe be a bad idea, the problem is the stock regulator cant handle the flow at idle when the car isnt consuming much fuel, you just set the regulator lower to compensate, thus at high rpm/power when the car is using more fuel your going to be running significantly lower fuel pressure then stock.

88rxn/a

iTrader: (6)

i wondered this myself?? wouldnt you get some kind of fitting(for the fuel rail) and the other end have it barrbed to fit fuel line to FPR???

jayroc

The previous owner of my car (87 base NA auto) put a walbro 255 on it. I have no idle or drivability issues, but it is a stock 19 year old FPR.. I plan on replacing it eventually as I suspect my MPG isn't where it should be.
I would also wonder about the pulsation dampner. Mine was removed and replaced with a banjo bolt, so that may also be something worth doing if you're swapping out to a higher capacity pump also.
BTW What should an aftermarket FPR be set to? ~43#?

MattB

40 PSI with the vac line OFF....


and, im started to get confused...why would you replace the PD with a banjo bolt?

where can i get a fitting to put where the stock FPR is now to attach to an aftermarket FPR?

rotorforce

I apologize for the way I phrased it. I meant on the aftermarket regulator once installed and stock regulator removed.

SureShot

The e-bay unit will work fine.
Scrounge a banjo fuel rail input fitting off any other 7.
Attach the fitting where the old FPR was.

For those of us without a chassis dynamometer:
Install the new FPR so you can temporarily poke it up over the cowl to see it while driving.
After you have it set, mount it back on the fire wall.

MattB

EDITED: sorry posted at the same time...

So buy the ebay unit...take the banjo bolt off my other TII engine, mount it so i can see it while driving....for testing purposes...and what should my adjustments be?

40 PSI with vac line off at idle
?? PSI with vac line on at idle
?? PSI with vac line on at WOT

ITS_A_RX_THING

I also am having the same prob. on my TII.

SureShot

dueling edits

MattB

well then keep reading as its solved....

EDIT : haha stop editing!!!

jayroc

The guy told me that's what he did. I believe it is simply plugged with a banjo bolt, not that there's a fitting attached to it. I mentioned it because the things are prone to leakage under stock conditions and putting on an aftermarket higher capacity fuel pump can only aggravate matters.

I just looked in the FSM.. Basically:
34.1-39.8 PSI at idle with the vac. reference line disconnected.
28.4 PSI with the vac line connected at idle
WOT should be about the same as the "vac. reference line disconnected" as the pressure should be the same as atmosphere(or very close).

When I set my last adjustable FPR, I did it with the car off. I just turned the pump on for a few seconds then off and adjusted the FPR after taking a reading, then repeated the process until it was right. I didn't start the car until I was at my desired pressure..
I don't remember if you can properly adjust the FPR if the car is running, btw. At least, the low pressure adjustable FPRs I worked with before were that way, you had to use the method above. I just use it because it works with both.

MattB

ok, well i dont have a problem doing it that way...ill have to run the lines so i can get to it without taking my IC off though...stupid top mount...

MattB

well i dont have the money to order an aftermarket FPR so i threw the old fuel pump back in...didnt seem to fix the problem...must be something else...but i also noticed there is a crack in the tube that connects the turbo to the IC...probably quite a big VAC leak...