Spider Injectors Clogged Completely
- Thread starter jce98
- Start date
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Checked the pressure, 60 PSI to prime 40 cranking, then bleeds off to 10?
east302
I'm Awesome
If there are no external leaks, it’s either leaking at the injectors, regulator or at the pump. If you pull the filter and add a valve, you can pressurize, close the valve (key off) and see if pressure holds.
If it holds, it’s leaking at the pump. If it drops, it’s through an injector or the regulator/return line to tank.
If it holds, it’s leaking at the pump. If it drops, it’s through an injector or the regulator/return line to tank.
To add to this, there is a rubber hose on the fuel lines, around the fire wall, where it curves down, on the driver's side. You can reach it from under the truck. You can pinch that hose off, with a pair of vise grips, once you cycle the key, or have someone else do that for you, then pinch off the hose. This will give you the same results, as mentioned above.
60 prime and 40 cranking, then bleeds off down to 10
someotherguy
Truly Awesome
Someone with more recent experience could tell you if that's sufficient. 60psi at key on sounds fine but the 40psi during crank doesn't. You've got some good suggestions in here so far; you can carefully clamp off the return line and see if it's the regulator. I have a thick piece of plastic that is folded over that I use to protect rubber lines when clamping them off this way. Only do this very temporarily just to get your readings.
Richard
Richard
Would it be possible I could have an issue with the main electrical connectors on top of the main body of the spider injector?
Unlikely. If the fuel pressure is bleeding off, there is a leak somewhere, and that's most likely your issue. 40 PSI, when cranking, is low. Once the engine does start, the fuel pressure will fall into the 50s PSI range, but if you rev the engine, the PSI will come up, with the RPMs. All of that, is once it's started, though. If your not holding over 60 PSI, pre start, that's most likely the problem. As for checking the voltage to the injectors, that's another issue in itself. You would have to pull of the electrical connector, and have someone read it , as the engine is being cranked. Maybe someone else knows a better way, IDK.
Unlikely. If the fuel pressure is bleeding off, there is a leak somewhere, and that's most likely your issue. 40 PSI, when cranking, is low. Once the engine does start, the fuel pressure will fall into the 50s PSI range, but if you rev the engine, the PSI will come up, with the RPMs. All of that, is once it's started, though. If your not holding over 60 PSI, pre start, that's most likely the problem. As for checking the voltage to the injectors, that's another issue in itself. You would have to pull of the electrical connector, and have someone read it , as the engine is being cranked. Maybe someone else knows a better way, IDK.
Thanks, I will give that a shot. I'm going to replace the fuel filter as well just to eliminate that.
I'm going to replace the fuel filter, just to eliminate that as a culprit. Along with cleaning up the ground on the fuel pump. This truck was stolen and when recovered, all of the grounds were cut and wiring was jacked up. Trans lines removed and oil cooler lines removed. I initially thought they were in the process of pulling the engine. They put a different engine in, hopefully it has less than the 300K I had on it. So not sure how many miles are on this engine yet, so I pulled the top intake off to check the spider. I had replaced the pressure reg. about a year ago, this injector assembly has the original pressure regulator and appears to be the original AC Delco spider.
