RShrimp
OBS Enthusiast
Yea, I recently went through AC hell because of a defective set of gauges.
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Key on engine off, the fuel pump will only prime ~2 seconds unless you jump the proper wire.I guess I need a new set...Idk...
I can get fuel to come out of the adapter (after fuel filter install) if I push in the stem while koeo but it's more like a dribble. I can get fuel to come down the pressure release hose...not a crazy amount of stream though....... But I can't get the needle to move on the gauge....
That fitting in the hose end just rests in there with a rubber sleeve...I flipped the sleeve around and same thing...
hmm...
One of the pieces isn't working right... Truck runs fine enough so obviously has some pressure.....right?lol
hazard fraught maddox set only one close with tbi adapter to satiate my impatience... hmm.
Eh, with a few recent mentions of leaks, I'd go ahead and take it off. I used to advocate leaving it in place, but that was my experience years ago with a different brand of the same style fitting. With what's out there today - especially from HF - I wouldn't risk it.I used the harbor freight one this past weekend. It came with the tbi adapter. I was scared to keep in on there though. It sounds like it is normal to do this.
That makes sense....Key on engine off, the fuel pump will only prime ~2 seconds unless you jump the proper wire.
apparently it is.Is that valve replaceable in the tbi adapter?
Definitely replaceable but I'm not sure where to source one from except manufacturer. Possibly you could use a tire core just for the testing and remove the adapter immediately afterwards? (Assuming threads and dimensions are the same, i doubt the seals on a tire core will withstand gasoline exposure for any extended period of time)apparently it is.
Does anyone know what I should look for to replace this? I'll try straightening the stem but replacing would be nice....
worked.....Possibly you could use a tire core just for the testing and remove the adapter immediately afterwards?
Good.worked...
OK pressure ANYWHERE on the supply side after the fuel filter. Easily within spec, although folks would prefer to be at the high-end of spec.11.5+ psi....idling...
Is that ok pressure if right after fuel filter?
You could REMOVE the wires from the oil pressure sending unit, and have no effect on the fuel pressure IF the fuel pump relay and wire harness were in good condition.What's weird is I could see the needle jiggle here and there..
When I was at Autozone talking to the one young guy there who has a GMT400, he mentioned one issue with these trucks that not many people know of is that, some janky oil pressure senders can flake out and modulate the fuel pump. Made me think of this when I saw the needle do that.
Ideally, you'd test the gauge against another "known-good" gauge. Or two or three "suspected good" gauges, and hopefully they'd all agree.not sure what the margin of error is on this gauge...and that it's 10 years old....