# Fuel pump prime at key on

**URL:** <https://community.ecumaster.com/t/fuel-pump-prime-at-key-on/2801>\
**Category:** EMU BLACK / CLASSIC\
**Created:** [November 18, 2024, 9:10pm UTC](https://community.ecumaster.com/t/fuel-pump-prime-at-key-on/2801 "2024-11-18T21:10:59Z")\
**Posts on this page:** 3\
**Page:** 1

<div class="post-metadata">

**Author:** ![ttxpc](https://dub1.discourse-cdn.com/flex013/user_avatar/community.ecumaster.com/ttxpc/32/2515_2.png) [@ttxpc](https://community.ecumaster.com/u/ttxpc)\
**Post date:** [November 18, 2024, 9:10pm UTC](https://community.ecumaster.com/t/fuel-pump-prime-at-key-on/2801/1 "2024-11-18T21:10:59Z")

</div>

Hi guys  
Since new my emublack on V2 software “blips” the fuel pump for a split second at key on/power on, regardless of the time settings in the software and if I invert the output the fuel pump runs fine.

When I load V3 firmware the fuel pump prime runs correctly for whatever time I set it for

Curious as to why this is so, haven’t been able to find a reason

---

<div class="post-metadata">

**Author:** ![Mark](https://dub1.discourse-cdn.com/flex013/user_avatar/community.ecumaster.com/mark/32/3915_2.png) [@Mark](https://community.ecumaster.com/u/Mark)\
**Post date:** [August 7, 2026, 3:49pm UTC](https://community.ecumaster.com/t/fuel-pump-prime-at-key-on/2801/2 "2026-08-07T15:49:37Z")

</div>

Hey did you find a fix? I just had my car mapped on dyno and now i have the blip, i dont wanna go to v3 now

---

<div class="post-metadata">

**Author:** ![ttxpc](https://dub1.discourse-cdn.com/flex013/user_avatar/community.ecumaster.com/ttxpc/32/2515_2.png) [@ttxpc](https://community.ecumaster.com/u/ttxpc)\
**Post date:** [August 9, 2026, 5:29am UTC](https://community.ecumaster.com/t/fuel-pump-prime-at-key-on/2801/3 "2026-08-09T05:29:18Z")

</div>

Yes, upgrading to v3 fixed the issue, couldn’t fix it in v2