Bad fuel pump? please help!

[VideoGameWrx]

I don't want to jump to conclusions based on a log, but I can clearly tell is that it is unsafe for me to go WOT until this is figured out. I felt that the car was running lean and stumble on acceleration occassionally on WOT, but at other times it would pull hard....This is log from crappy acceleration and very dangerous AFRs

the 4th value is AFR

3rd gear

01:48:05.097,1.53,4.08,13.90,3437,17.50,16.01,88.2 4,100.00,47
01:48:05.275,1.70,5.69,14.24,3480,14.50,16.86,98.2 2,100.00,48
01:48:05.449,1.86,7.37,14.24,3488,14.00,17.82,108. 11,100.00,48
01:48:05.627,2.04,9.30,14.47,3580,14.00,19.70,123. 28,100.00,48
01:48:05.801,2.24,11.10,14.47,3698,14.00,22.15,134 .78,100.00,50
01:48:05.979,2.42,13.21,15.16,3740,14.00,30.77,148 .56,100.00,50
01:48:06.153,2.61,14.54,11.94,3801,13.00,35.11,169 .00,100.00,50
01:48:06.329,2.71,15.78,12.29,3941,13.00,35.68,172 .10,100.00,52
01:48:06.505,2.82,17.69,12.86,4017,13.00,36.99,179 .75,100.00,52
01:48:06.681,3.05,18.83,12.75,4065,13.00,42.85,209 .01,100.00,54
01:48:06.856,3.13,19.74,14.24,4157,13.00,44.23,218.98,100.00,54
01:48:07.032,3.18,20.19,14.36,4286,10.50,47.00,226.00,100.00,54
01:48:07.208,3.32,20.44,15.04,4240,10.50,48.45,239.96,100.00,57
01:48:07.384,3.31,20.59,16.19,4401,8.50,49.74,242.16,100.00,57
01:48:07.560,3.34,20.34,16.42,4481,8.50,49.76,251.42,100.00,57
01:48:07.736,3.33,20.11,17.34,4618,8.00,66.91,252.31,100.00,60
01:48:07.912,3.26,19.97,13.09,4688,9.50,65.02,248.33,100.00,60
01:48:08.088,3.21,19.86,12.06,4838,9.50,66.92,253. 24,100.00,64
01:48:08.264,3.16,19.61,11.60,4883,9.50,67.09,255. 05,100.00,64
01:48:08.444,3.16,19.39,11.25,5084,10.50,67.54,261 .52,100.00,64
01:48:08.616,3.18,19.01,11.25,5140,11.00,69.42,267 .08,100.00,68
01:48:08.792,3.13,18.93,11.37,5296,12.50,70.18,269 .45,100.00,68
01:48:08.970,3.12,18.56,11.25,5330,12.50,71.18,274 .74,100.00,68
01:48:09.145,3.07,18.33,11.25,5494,13.00,70.50,273 .30,100.00,71
01:48:09.321,3.04,18.23,11.25,5531,13.00,71.50,275 .22,100.00,71
01:48:09.496,3.01,18.29,11.25,5673,13.50,70.79,279 .13,100.00,75
01:48:09.673,3.04,18.27,11.25,5686,14.50,73.82,288 .41,100.00,75
01:48:09.848,3.01,18.37,11.25,5832,15.50,73.99,294 .54,100.00,75
01:48:10.041,2.98,18.37,11.25,5919,15.50,74.65,289 .94,100.00,79
01:48:10.216,2.97,18.20,11.37,5995,15.50,74.50,293 .01,100.00,79
01:48:10.393,2.93,18.08,11.25,6033,16.00,75.46,293 .77,100.00,79
01:48:10.568,2.89,18.06,11.25,6152,16.50,75.44,293 .77,100.00,83
01:48:10.746,2.86,17.83,11.25,6271,17.00,74.81,295 .31,100.00,83
01:48:10.920,2.78,17.91,11.25,6318,19.00,73.58,290 .71,100.00,86
01:48:11.096,2.75,18.16,11.37,6432,19.50,74.13,293 .01,100.00,86
01:48:11.272,2.75,18.10,11.25,6460,20.00,74.10,295 .31,100.00,86
01:48:11.448,2.71,18.25,11.37,6608,20.00,74.42,295 .31,100.00,89
01:48:11.624,2.68,18.22,11.37,6660,20.50,74.71,295 .31,100.00,89
01:48:11.800,2.63,3.56,11.25,6714,20.50,75.31,294. 54,100.00,89
01:48:11.976,0.87,8.16,11.25,7163,20.50,74.48,295. 31,0.00,92



However, earlier in the day here is a perfectly normal pull

4th gear

23:03:00.696,2.82,16.86,11.71,3671,13.00,50.37,176 .61,100.00,68
23:03:00.872,2.95,17.89,11.25,3689,13.00,54.25,186.57,100.00,68
23:03:01.048,3.03,18.85,11.25,3796,13.00,55.73,192.84,100.00,70
23:03:01.224,3.09,19.57,11.25,3822,13.00,57.52,196.89,100.00,70
23:03:01.400,3.12,20.07,11.25,3852,13.00,59.79,205.39,100.00,73
23:03:01.575,3.15,20.32,11.25,3947,13.00,61.21,208.95,100.00,73
23:03:01.752,3.16,20.30,11.25,3987,13.00,62.96,213.68,100.00,73
23:03:01.927,3.17,20.48,11.25,4043,13.00,64.76,215.66,100.00,75
23:03:02.103,3.20,20.59,11.25,4102,13.00,65.27,220.10,100.00,75
23:03:02.279,3.24,20.67,11.25,4136,13.00,67.00,225.16,100.00,75
23:03:02.455,3.24,20.75,11.25,4188,13.00,68.14,229.79,100.00,78
23:03:02.632,3.28,20.73,11.25,4259,13.00,68.88,234.43,100.00,78
23:03:02.807,3.27,20.63,11.25,4345,13.00,70.16,238.67,100.00,80
23:03:02.984,3.22,20.15,11.25,4328,13.00,70.21,234.00,100.00,80
23:03:03.159,3.16,19.49,11.25,4396,13.00,67.96,234.00,100.00,80
23:03:03.334,3.12,19.20,11.25,4475,13.00,68.51,233.58,100.00,83
23:03:03.516,3.10,19.01,11.25,4523,13.00,68.43,231.89,100.00,83
23:03:03.702,3.07,18.66,11.25,4559,13.00,68.06,236 .53,100.00,83
23:03:03.879,3.08,18.87,11.25,4624,13.00,69.73,238 .23,100.00,86
23:03:04.054,3.10,19.09,11.25,4670,13.50,69.60,241 .72,100.00,86
23:03:04.231,3.13,19.38,11.25,4738,13.50,72.68,247 .01,100.00,89
23:03:04.406,3.13,19.61,11.25,4798,13.50,72.91,248 .33,100.00,89
23:03:04.582,3.15,19.45,11.25,4820,14.00,73.43,256 .90,99.22,89
23:03:04.758,3.04,18.83,11.25,4848,15.00,72.20,247 .45,98.43,92
23:03:04.934,3.07,18.87,11.25,4873,15.00,74.32,255 .05,98.82,92
23:03:05.111,2.90,11.18,11.25,4977,15.50,71.86,253 .21,18.82,92
23:03:05.286,0.96,-7.35,11.25,4905,9.50,0.00,92.31,0.00,94
23:03:05.463,1.85,-9.11,12.75,4860,9.50,0.00,163.97,0.00,94
23:03:05.638,1.55,-9.73,13.67,4918,9.50,0.00,119.53,0.00,96
23:03:05.814,1.13,-10.06,25.27,4908,9.50,0.00,89.54,0.00,96
23:03:05.990,0.89,-10.38,25.27,4905,9.50,0.00,69.00,0.00,96

Any input would be appreciated....

my thoughts: change fuel filter, check fuel pump?

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[VladiWrX]

holy batman!!!!!!!! WAY TOO MUCH NUMBERS

[VideoGameWrx]

lol sorry, 4th value is AFR, and 5th value is RPM, in the first pull I am running lean from 3-4.5k RPM, then in the second pull it is nice and rich the whole way through with the same boost levels and evrything else equal....what gives?

[benw]

running some kind of injection?

[VideoGameWrx]

Yes water/meth it begins to spray at 10psi and continues to spray the same amount until I go below 10psi. I checked the filter on the nozzle a couple of weeks ago and it is clean.

[ride5000]

if you've got sufficient fuel in the tank, then you should pull the pump and inspect/clean the sock on the pickup. clean it with non chloro brake cleaner, and clean it really well. reinstall and report back.

i had similar issues a while back and the sock was pretty dirty... probably dirty gasoline. symptoms just like fuel starvation, but still plenty of fuel in the tank.

hth
ken

[VideoGameWrx]

thanks, it definately acts as if there is no fuel in the tank even if there is a fuel tank. And it is completely random. Maye I can get to cleaning the fuel pump this weekend, The car runs like a monster when the fuel get there, I am going to heve to start being more careful on where I fill up

[shootinsoobie]

i looked at this and thought i was back in the matrix!!

[akira02rex]

that looks like an afr reading from the oem o2 sensor, is it?

[VideoGameWrx]

Originally Posted by akira02rex

that looks like an afr reading from the oem o2 sensor, is it?

yes it is, i know its not very accurate but it doesnt give me an idea of rich vs lean