Intermittent Cutout Problem - AGAIN

On 12/15/04, I wrote:

I have a 2000 Grand Prix GTP. This is a weird problem. It has been happening for about 2 months. I will start from the beginning.
- About 2 months ago, the engine would sporadically cut out when I was accelerating. It would always happen above 3000 rpms. I would accelerate and sometimes (1 out of 4 or 5 times) the engine rpms would just cut out, go down to idle and then spring back up again to 3000 rpms. This happened when my foot was on the accelerator and I would not take my foot off. The acclerator pedal would be in the same spot the whole time.
- I have taken it in twice to repair technicians and they couldn't replicate the problem so they said they couldn't fix what they didn't know was wrong.
- Two months later, the problem is still happening. The problem has changed slightly. Now sometimes, instead of shooting back up to where the rpms were initially at, it just dies. This happens when I am on the main road going like 30 or 40 mphs. Again, it always happens approximatly above 3000 rpms.
- Two days ago, the engine did the problem like normal, and I kept my foot on the accelerate while the rpms were down and I blew the fuel pump fuse. I replaced the fuse and it happened again about 4 miles down the road.
- Because it blew the fuel pump fuse, I replaced the fuel pump relay and the fuel pump speed control relay. Since then, the original problem still happens but I haven't blown the fuel pump fuse since the relays were replaced.
- The engine still cuts out (not all the time though). SInce this problem happened and it blew the fuse, I am thining it is a fuel system problem.
- Now, heres what has been recently replaced on my car. I have recently cleaned the fuel system, replaced fuel filter, replaced the two relays described above, and I currently have the fuel pump resistor on order and should be here any day.

You can view the thread at http://www.automotiveforums.com/vbulletin/showthread.php?t=332683

I have replaced the CPS sensor and the car is still having the same problem. It is weird because when the problem happens, it blows the fuel pump fuse that is located in the fuse box under the hood. I have also replaced the Fuel Pump Relay and the Fuel Pump Speed Control Relay and it still happens. I fuel pump fuse is rated for 15 amps and I know the fuel pump is supposed to take approximatly 8 amps. Possibly the fuel pump resistor (I have a GTP), wiring short somewhere ? Any help would be great

-Ben

A local member in the Seattle club was having the same problem blowing the fuel pump fuse and he replaced the fuel pump and no problems since he did that.Just a thought!

~Larry~

Yea. That is probably what I will do next. I replaced the fuel pump resistor today and I still blew the fuse. The fuse seems to only blow when I am going over 3000 RPMS (accelerating fast). If I keep it under 3000 RPMS, the fuse doesn't blow. So, I was looking at the zzperformance website and they have a walbro fuel pump for $134. I think I will get that.
I love my car and if it is the fuel pump, that is a little sad if it goes out at only 60,000 miles. I will let everybody know what happens and if anybody has anymore suggestions, let me know.

-Ben

Heres a quick question for anybody. How does the walbro fuel pump match up to the stock fuel pump in performance?

Also try www.clubgp.com (http://www.clubgp.com), there are more ppl there may help you.