Both pumps create negative pressure to draw the fuel through the lines. However, the low pressure between the pump and the fuel tank, in combination with heat from the engine and/or hot weather, can cause the fuel to vaporize in the supply line. This results in fuel starvation as the fuel pump, designed to pump liquid, not vapor, is unable to suck more fuel to the engine, causing the engine to stall. This condition is different from vapor lock, where high engine heat on the pressured side of the pump (between the pump and the carburetor) boils the fuel in the lines, also starving the engine of enough fuel to run. Mechanical automotive fuel pumps generally do not generate much more than 10–15 psi, which is more than enough for most carburetors.
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| Item | type | Reference |
| Plunger | A | 1 418 421 053 1421-053 |
| Plunger | A | 090150-2850 2850 |
| Plunger | A | EP0191460/17 EP0191460/17-D |
| Plunger | A | 131101-6920 0-3 |
| Plunger | A | 090150-3800 0-4 |
| Plunger | A | 131101-7020 0-4 |
| Plunger | A | 131101-7520 0-9 |
| Plunger | A | 090150-1161 1021 |
| Plunger | A | 11-108FB 11-108FB |
| Plunger | A | 1 418 305 004 1305-004 |
| Plunger | A | 1 418 305 505 1305-505 |
| Plunger | A | 1 418 305 518 1305-518 |
| Plunger | A | 1 418 305 540 1305-540 |
| Plunger | A | 1 418 305 540 1305-540F |
| Plunger | A | 1 418 321 039 1321-039 |
| Plunger | A | 1 418 325 023 1325-023(320/9) |
| Plunger | A | 1 418 325 095 1325-095 |
| Plunger | A | 1 418 325 096 1325-096 |
| Plunger | A | 1 418 325 103 1325-103 |
| Plunger | A | 1 418 325 142 1325-142 |
| Plunger | A | 1 418 325 156 1325-156 |
| Plunger | A | 1 418 325 157 1325-157 |
| Plunger | A | 1 418 325 159 1325-159 |
| Plunger | A | 1 418 325 160 1325-160 |
| Plunger | A | 1 418 325 525 1325-525 |
| Plunger | A | 1 418 325 895 1325-895 |
| Plunger | A | 1 418 425 021 1425-021 |
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