According to the formula above, we suggested the Nf2=100 and the ΔT2=120K(-40℃ to +80℃), theΔT1=30K(for the most conditions the temperature from RT20℃ to 50℃). For the fuel pump module there are some plastics parts, we suggest the k=3.

We can get the result Nf1=6400

Assumption: 330days/year(can not be used every day) and 2 cold starts per day.

The life time is 6400/2/330=9.7years