Walbro offers three fuel pumps for the Probes:
| PSI/ | Probe | 190 lph | 255 lph | 255 lph |
| LPH | OEM | GSS278 | GSS315 | GSS341 |
| 0 | 178 | 208 | 280 | 288 |
| 10 | 159 | 197 | 269 | 276 |
| 20 | 132 | 182 | 254 | 257 |
| 30 | 110 | 163 | 235 | 242 |
| 40 | 91 | 144 | 216 | 223 |
| 50 | 72 | 125 | 201 | 208 |
| 60 | 53 | 110 | 170 | 189 |
| 70 | 30 | 91 | 117 | 174 |
| 80 | 0 | 68 | 34 | 163 |
| 90 | 34 | 0 | 140 | |
| 100 | 0 | 95 | ||
| 110 | 64 | |||
| 120 | 30 | |||
| 130 | 0 |
'Probe OEM' is the stock fuel pump in the first generation GT
