FiTech EFI Tuning Forum MenuForum NavigationForumMembersActivityLoginRegisterForum breadcrumbs - You are here:ForumUltimate LS systems: LS usersNo prime signal on yellow wire on …Please Login or Register to create posts and topics.No prime signal on yellow wire on pump relay.55prostreet@55prostreet19 PostsMembers#1 · June 6, 2019, 6:45 pmQuote from 55prostreet on June 6, 2019, 6:45 pmI can short yellow relay wire to ground and pump runs. I can short yellow relay wire to ground and pump runs. Paul Bell@paul-bell87 PostsMembersModerators#2 · June 6, 2019, 6:56 pmQuote from Paul Bell on June 6, 2019, 6:56 pmDuring cranking, do you see RPM on the handheld? During cranking, do you see RPM on the handheld? 55prostreet@55prostreet19 PostsTopic AuthorMembers#3 · June 6, 2019, 7:16 pmQuote from 55prostreet on June 6, 2019, 7:16 pmEngine runs fine needs adjustments / tuning. Handheld seems to work ok change values and memory recalls settings. Engine runs fine needs adjustments / tuning. Handheld seems to work ok change values and memory recalls settings. Post Reply: No prime signal on yellow wire on pump relay. Cancel