Well, you have still not answered the necessary detail. 
And you have quite a number of problems. One is for example, the suggestion that you are going to power the ESP8266 with IIRC, an 18650 LiPo battery - but how are you going to charge the battery every couple of days?
Using a 3.3 V relay is going to be rather inefficient for a start. If we presume you mean a common SRD-03VDC-SL-C relay, its coil resistance is in fact 25 Ohms and requires 120 mA when operating. That means it will not work at all with a 25 Ohm series resistance in your wires and even without the wires, 125 mA will be a significant discharge on the battery.
Next problem is that that the Songle relay is not particularly durable. What sort of pump is it supposed to be controlling? You probably need it to control a proper mains contactor in order to switch the pump.
But there is the absurdity. What is powering your pump? If it is mains electricity you have no reason to use a battery and its associated problems. Whatever the power source is for the pump, you use that power source to supply your ESP system and the (higher voltage version of the) relay. 25 Ohms in series with the 5 V supply back to the regulator on an ESP8266 module is not so much of a problem.
And why are you using the ESP8266 in the first place? Presumably for WiFi connectivity, otherwise you would be using a Pro Mini. So if you are using WiFi, there is no need to run a wire 30 meters in a conduit (a piece of hose would probably suffice) to protect it from the sun. You use a second ESP8266 at the pump.
You really seem to be doing it all wrong! 