Fuel Pump Going Out?!?
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Fuel Pump Going Out?!?
So other than checking the fuel pressure, and seeing an overly lean AFR, what other symptoms are there for a fuel pump going out?
I haven't checked my fuel pressure yet (I'm going to), but despite my recent re-tune, my truck is still running incredibly lean. It was just under load, and now while cruising at 2000rpm and sometimes as low as 1500rpm it starts to cut out.
I think its probably the fuel pump, but in my past experiences with OBS trucks they just go out, with no signs of a warning.
Also what pumps are ya'll using, because the autoparts stores around here want around 3 bills for one and I can get a walbro for like half that.
BTW there's no way in hell my injectors are maxed either, because I'm still sporting the mighty 4.8!
I haven't checked my fuel pressure yet (I'm going to), but despite my recent re-tune, my truck is still running incredibly lean. It was just under load, and now while cruising at 2000rpm and sometimes as low as 1500rpm it starts to cut out.
I think its probably the fuel pump, but in my past experiences with OBS trucks they just go out, with no signs of a warning.
Also what pumps are ya'll using, because the autoparts stores around here want around 3 bills for one and I can get a walbro for like half that.
BTW there's no way in hell my injectors are maxed either, because I'm still sporting the mighty 4.8!
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This is after the logging that you have done. You have got a new tune since the last time that we talked.
You are saying that it is cutting out at 2000RPM, will it do it when it is in park and you rev it to 2000, or it will just do it when you are crusing along and slam the pedal.
You are saying that it is cutting out at 2000RPM, will it do it when it is in park and you rev it to 2000, or it will just do it when you are crusing along and slam the pedal.
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I've lost 3 stock fuel pumps,none of which gave much warning.I towed it 2 times and limped home on the third one.I was using a Boost a pump at the time.Now I use an inline pump with the stock pump.
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Originally Posted by desTRUCKtive
This is after the logging that you have done. You have got a new tune since the last time that we talked.
Originally Posted by desTRUCKtive
You are saying that it is cutting out at 2000RPM, will it do it when it is in park and you rev it to 2000, or it will just do it when you are crusing along and slam the pedal.
It completly shut off at the stoplight today. It's never done that!
I'm putting a gauge to it tonight and changing the filter I'll keep ya'll posted.
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Originally Posted by whitt1
Check the fuel regulator,that sound like the problem you are having.
Check it how? It's just the factory one, and it's never been messed with.
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Okay, I just put a pressure gauge on it, and at idle I'm seeing 53psi.
Then, while in Park:
-When I quickily blip the throttle it jumps up to 58psi and then back down.
-Slowly reving it up, it drops to about 47-48psi then it breaks up and shuts off, or I have to let off.
Shouldn't I be seeing 58-60psi? Hmmm....
Then, while in Park:
-When I quickily blip the throttle it jumps up to 58psi and then back down.
-Slowly reving it up, it drops to about 47-48psi then it breaks up and shuts off, or I have to let off.
Shouldn't I be seeing 58-60psi? Hmmm....
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Ok, changed the filter and I gained a few psi.
I sit at 55psi at idle, and as I rev it up it finally drops to 50-51psi at about 4500rpm. This isn't normal is it?!?
I sit at 55psi at idle, and as I rev it up it finally drops to 50-51psi at about 4500rpm. This isn't normal is it?!?