The two sides played for a barren stalemate in Khartoum on Saturday.
The point sees Wekundu wa Msimbazi move to seven points on top of Group A.
They won both of their opening matches while Merrikh picked up their first point of the group phase, but remain stuck at the bottom.
The home side bossed the opening half, doing everything right but score.
They came closest after 25 minutes but saw Tony Omayarue’s header bounce off the bar.
Simba didn’t create much of danger on the other end.
Simba’s best chance came off a Clatous Chama freekick from the edge of the box with five minutes left to the break.
However, the midfielder’s curling effort didn’t have enough power, the keeper saving.
In the second half, under the scorching Khartoum half, none of the two teams could impose much danger.
Chris Mugalu had a chance for Simba with a shot on the half turn that went straight to the keeper while on the other end.
Mattocks and Oyamarue had weak attempts at goal which never troubled Kakolanya.
Simba made offensive changes late in the game.
Francis Kahata and Meddie Kagere coming off the bench, but they couldn’t inspire a goal for the Tanzanian side.