WestCoastie
Member
- Joined
- Jul 9, 2023
- Posts
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(Edit) Solved, new fuel pump fixed the issue.
(Edit… to the Edit) A week went by of normal starting. Then the hard start acted up again. Only thing I hadn’t replaced is the cam sensor, it tested ok. Replaced it with GM genuine cam sensor and no more problems.
2003 GMC Yukon XL 1500 5.3
Back Story:
1. Engine spun a bearing
2. Sat outside for 6 months or so before got around to rebuild
3. After rebuild experienced hard starts (would sometimes fire right up, other times I had to crank a couple times before it finally would start up). But once it was running it seemed to run just fine.
I chocked up the issue to an electrical gremlin. As I had a couple to figure out after truck sat for so long. Eventually I fixed everything besides the hard starting (and 4x4, but that’s a whole other issue).
A week ago (right before heavy snow started falling) the truck just refused to start altogether.
Finally got a test kit to measure fuel pressure. When I initially put it on there was no pressure. I jumped the fuel pump and got up to about 50psi. After removing power, pressure fell to about 40 and slowly started falling.
I only jumped the fuel pump relay because it was easier, not because the key won’t activate it.
Everything about this screams fuel pump to me. But the fuel pump was replaced at 30k miles (about 110k in it now).
Im curious what everyone thinks.
Thanks!
(Edit… to the Edit) A week went by of normal starting. Then the hard start acted up again. Only thing I hadn’t replaced is the cam sensor, it tested ok. Replaced it with GM genuine cam sensor and no more problems.
2003 GMC Yukon XL 1500 5.3
Back Story:
1. Engine spun a bearing
2. Sat outside for 6 months or so before got around to rebuild
3. After rebuild experienced hard starts (would sometimes fire right up, other times I had to crank a couple times before it finally would start up). But once it was running it seemed to run just fine.
I chocked up the issue to an electrical gremlin. As I had a couple to figure out after truck sat for so long. Eventually I fixed everything besides the hard starting (and 4x4, but that’s a whole other issue).
A week ago (right before heavy snow started falling) the truck just refused to start altogether.
Finally got a test kit to measure fuel pressure. When I initially put it on there was no pressure. I jumped the fuel pump and got up to about 50psi. After removing power, pressure fell to about 40 and slowly started falling.
I only jumped the fuel pump relay because it was easier, not because the key won’t activate it.
Everything about this screams fuel pump to me. But the fuel pump was replaced at 30k miles (about 110k in it now).
Im curious what everyone thinks.
Thanks!
Last edited: