Well, the kids and wife went to grandmas tonight; so under the car I went to drop the tank.
Please see attached pictures of my Walbro pump. These are pictures of the pump after being pulled from the tank. How does it look? Anything obvious that does not look correct?
I inspected all fuel lines going into the tank; all look good.
I inspected the wires going into the tank; all look good.
I inspected the fuel lines and rubber hose in the tank; all look good.
I inspected the fuel filter sock and filter screen at the bottom of the pump; all look good.
However, I believe this part may be important. I was surprised at how flat the sock screen was when I pulled it out. I then measured from the bottom of the fuel pump screen as it is installed on the pump to the top of the fuel pump unit lid that seals with the top of the fuel tank. It measured 8 1/8". Hmmm. I then meaured on the gas tank from the top seal to the bottom of the fuel tank, 8 1/8". According to my multiple measurements and visual inspection, I believe this screen was compressed againt the bottom on the fuel tank. This seems way to tight to allow adequate fuel to the pump under increased boost (the problem I keep having). There are to small plastic pieces in the pump filter sock to keep the sock seprated, but they seem they would not help in this situation. Since I cannot make this measurement with the pump istalled, it is hard to confirm.
Tell me I am crazy and this should not be the reason.
Now, how to preoceed???
Thanks!
Matt
Ttype6,
Do you still have a known working unit to sell?
.if you had the proper adapters, you could hook fp gauge right out of filter and dead head pump for a few secs to see what max psi is...
Weren't there a bunch of problems with them last year?
Problem solved.
To conclude this thread, I want to thank all those who have contributed their help in diagnosing and resolving this issue on my Grand National.
Obviously, there are many people on this forum willing to offer thier time and knowledge.
I consider myself a rookie regarding my turbo Buick. The idea that others can guide me through this process is fantastic.
Thanks again!
Matt
Does this mean that you are back to default settings on your chip (BLM lock at 128)?
The chip burner makes an educated guess as to what your motor will need at different loads. Then the oxygen sensor adjusts up or down from there during closed loop operation. The block learn,at idle and part throttle,could be anything but 128 and different for each. It's not important what this number is.
At WOT operation the chip is adjustable to allow you to enrichen or enlean the fuel mixture based on what the motor needs. No matter what,this number is always 128 as viewed from the Scanmaster.
Matt's problem was that his fuel pump wasn't supplying enough fuel at WOT,so no matter how long the injectors were commanded to stay open,the motor only got the maximum,and not enough,amount of fuel that the pump could provide to feed the motor. Since this was not enough fuel for the motor's requirements,the motor was lean as indicated by the O2 sensor. Matt can,now,easily see an O2 number of .830 or more because he,now,has a pump that can supply as much as he commands it to. If the default number,for WOT fuel mixture,in the chip supplies enough fuel for the motor,you would leave this adjustment at the default setting. If your motor required more or less fuel,than the default setting,you would move this number up or down from the default number of 128. The guess,only,needs to be in the ball park.