Reply to thread

Message: <blockquote data-quote="stutaeng" data-source="post: 28926" data-attributes="member: 6175">My 99 sometimes does this but in the afternoon after sitting in the sun when I get off work. I haven't tried diagnosing it.I did once cap the return line with a vacuum cap and hose clamp and the pressure jumped to like 80 psi and it held. That's when I did my V8 swap and I was messing with trying to start it even tho I hadn't removed VATS from the system. I really did that because I was curious since I was still on the original pump at 265k (I'm not at like 286k and still on the original pump.)You can also pop the fuel rail and put some paper towels, prime the system and see if an injector(s) leak.My truck had the 4.3 and I come from that "spider injector" system which is atrocious because you can't easily do these kinds of tests on that system, so the LS engine platform is very easy to troubleshoot in my opinion.</blockquote>