HELP! Walbro fuel pump/no idle????
 

Ok i need some help, I set my boost controoler to 10 psi and it works great i set it to 15 psi and my car would lean out. So then i put on a walbro pump, i notice as soon as i crank it the car hardly idles and when i try to hold it at ilde it sounds horrible. I decide to take it for a spin anyways. It boosts great! 15 pounds no problem! It doesnt lean out, and as long as my foot is on the gas it drives like a champ! but as soon as i come to idle it cuts off, or barely idles??? So i switch out the pump back to the old Turbo II pump and it drives and idles just like its old self. What can i do to be able to use the Walbro and still idle? I love the way the Walbro lets me boost but i need to be able to idle so i can drive! Im sure its something im probably overlooking but cant figure it out. I was thinking maybe adust my Fuel Pressure Regulator (SARD) or something but i cant understand why that would affect idle and why wouldnt it affect it with the old pump on? Plus i have no idea how to adjust it! Please Help!

Someone... Any ideas???

Could it be that the Walbro is flowing more than the stock FPR is capable of handling? This could cause it to run rich and idle like crap.

Possible, but many people, including myself, are running Walbro's on stock TII's without issue. Is your resistor relay failed, causing the pump to see 12v at all times? That would cause it to get a ton of gas at idle.

I am running a sard fpr not the stock one... Where is this relay at and how do i check it?

What have you set the static fuel pressure at? If it's too much more than the stock 36psi then your idle mixture will be too rich to hold an idle.

Where would i set this static fuel pressure at? And why doesnt this affect the car when the stock pump is in?? The SARD FPR came with directions but its all in Japanese, so i have no clue how to adjust it!

Help me! help me! help me! I wanna take it to the track this weekend!

bump!

If you don't know how a FPR works, why did you put it in...? :Wconfused

Aftermarket FPR's are adjustable (which is the whole point of having one), so if you just throw it on without checking the fuel pressure you could be running higher-than-stock pressure causing the engine to run rich, or worse, lower-than-stock pressure causing the engine to run lean. Sounds like you got lucky and it's rich.

Some FPR's come with a pressure gauge but if you don't have one then you need one. You adjust the pressure with a screwdriver or Allen key after undoing a locknut. The pictures in the instructions should show this. This is done with the fuel pump on and the engine not running, or with the engine running and the vac hose pulled off the FPR.

Know how one works just dont know how to adjust it. Im gonna go get a new fuel pressure gauge case the one that was on there is broke! and then i will see what my fuel pressure is at andle and just keep screwing around with tthe fpr until its right. The directions were in japanese and i dont read or speak japanese too fluently.

So what does the gauge that's on there say? Is it more than the stock 36psi?

Ok i ordered a gauge but dont know when it will be here. So let me get this right. First i jump the connector, then turn the ignition on, and then check to see where the fuel pressure is on my new gauge and adjust it to 36-38 psi??? Im also wondering what made my old gauge break? its a b&m and it reads 0-100 psi and some how the needle is pushed past 100 and not working??

did you test your gauge before buying a new one? Could just be a grounding issue or a bad sender. Unless something burned it up I don't see how the whole thing would just fail all of a sudden. When I would have grounding issues on mine it would peg the 100 side. Check it out and see, no one can do this for you except yourself.

Its not a eletrical gauge its a inline mechanical one. I have the sard fpr and it mounts up right on the fpr.

Correct. :)

What are you using to control fuel and/or ignition? What kind of wideband O2 sensor are you using to know if its running rich or lean? Stock ECU or aftermarket?

im running the emanage ultimate with a zietronix wideband, but havent done any tuning on it yet. Its still running as if it were a factory ecu. I would crank up my boost to 15 psi and you coule see the afr lean out, just as a quick test i had the walbro laying around and decided i would throw it in and see what it does. (also no time to tune) It responded very nice! Except at idle! so once i get it to idle good i will be happy.

Ok just wanted to update, i put a gauge in, turns out my fuel pressure was wayyyyyyy to high. It was so high i think it trashed my FPR when i turned it down past 40 psi it would bounce between 20 - 40 PSI and make all kinds of wierd hissing noises. So i think the FPR is trashed. I set it at 40 and drove it and it drove ok except for hard stuttering at about 2500 RPM. So i ordered a new FPR. And put my old pump back in for now. I think it definitely has to be the FPR because it was making all kinds of hissing noises but with the oem turbo pump NOTHING..

hmmm, I wonder if by some means you didn't hit over 100 psi on the fuel pressure, mess up the fp gauge and the regulator?