I agree. Either that or a fuel delivery issue. Think lift pump.
Have only ever driven manual trans so never had park - curious why neutral is better?
Got a holley red fuel pump on it, got a few leaking injectors, IP is turned down low enough to not roal coal really. IP could be worn but I don’t think so honestly. Could the fuel leak from the injectors cause issues ?? Does that mean airs getting in the fuel ?
Probably not. I'm assuming that you're talking about the return caps and lines here. The line between my #2 and #4 injectors has been seeping for a couple of years when it's running. I have no issues while it's running or when I'm starting the engine.
Referring to the assumption above, no. Air can't get into the fuel on the feed side from the return side. This is only talking about while the engine's running since you only mentioned running issues.
Going off of this and your first post, maybe the issue is your Holley red. Some people have had issues with them recently. Maybe you should put a fuel pressure gauge between the Holley and the injector pump. I'm running a Holley blue and a fuel pressure gauge and I LOVE that gauge. It's another gauge that I now feel is essential to have. Going back to your red, if it's possibly having issues providing enough fuel at higher RPM, like when you're revving the engine to get up slick hills, this could explain the sometimes dying part. One other thing that I've noticed. My Holley blue doesn't like pumping cold fuel. I mean when it's in the lower teens or single digits. I just don't have the fuel pressure that I normally do. Yes I am running anti gel so that's not it. That's one thing that I never would have thought about if not for my fuel pressure gauge.
There is a line that runs from the #1 injector return cap that goes to the filter head, in factory form. I always delete that line on my trucks, because it can allow air into the inlet lines in certain few conditions, especially at high rpms. There is actually a TSB to remove that line anyways, for this reason.
The injectors aren’t always firing, and since there isn’t any real pressure on the return side, that should give it a chance for air to get in. Perhaps I’m wrong, but I’ve had particularly bad return lines affect how the engine runs.
That line was to help bleed the air out of the filter, right? If it's to bleed air out, then the air goes from the filter through the return lines back to the tank. When the engine's running, there's more fuel pressure in the filter than in the return lines. The only way that air could get from the return lines to the filter through that line would be if there's more pressure in the return lines than in the filter. Since there's little to no pressure in the return lines, that's pretty difficult to make happen.
