Paul_KD7HB:
Perhaps someone could help if you described what not working perfectly actually means.Paul
Sorry, you are right, should do that.
If only one mosfet is connected to singal, injector open and close with the frequency of PWM signal. When both mosfets are connected (by gate of course) they both not working, are still closed.
groundFungus:
Are those modules the ones with the IRF520 MOSFET? If so, be aware that they are not logic level MOSFETs and will not fully turn on with a 5V gate signal*. The FQP30N06L MOSFET that the OP linked in their first post is a much much better choice.*See the Rds(on) spec and Figure 3 in the IRF520 data sheet.
That is good point, thanks!
But did very similar circuit on bradeboard with IRLZ44N, and it behaves exaclty the same.