The dreaded P0300 code has come!! Help!
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Thread Starter
TheCorvetteBen
Joined: Feb 2007
Posts: 4,987
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From: Van Alstyne, TX
Using the FSM, I have narrowed it down to the fuel pump, strainer, regulator, and or filter. I have already replaced the regulator, will replace the filter as well. I pulled out the fuel sending unit, and the strainer was collapsed around the base of the pump. I will replace the strainer first, and see what the fuel pressure looks like. I will hold off on the pump since removal is pretty simple.
Thread Starter
TheCorvetteBen
Joined: Feb 2007
Posts: 4,987
Likes: 144
From: Van Alstyne, TX
Update:
Replaced Fuel Filter, Pump, Strainer, and Regulator and ZERO change to fuel pressure. Idles right at 32 psi, No leak down either...
Kinda stumped on this one
Replaced Fuel Filter, Pump, Strainer, and Regulator and ZERO change to fuel pressure. Idles right at 32 psi, No leak down either...
Kinda stumped on this one
Last edited by chstitans42; May 12, 2016 at 05:47 PM.
Race Director
Joined: Mar 2015
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Call some part places many will test for free. My fatherinlaw had some bad gas autozone had some stuff that cleared it up in a few minutes. pressure still sounds to low is your gauge good? Maybe water in the system.
pressure still sounds to low is your gauge good? Maybe water in the system.
Last edited by antfarmer2; May 13, 2016 at 10:06 AM.
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Racer
Joined: Mar 2016
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From: Flowood MS
If it's not a bad gauge or bad FPR, you really are only left with ignition components to check at this point.
Race Director
Joined: Oct 2008
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From: Lansing MI
This 30 and 32 psi of fuel pressure doesn't sound right at all.
I thought it was more like 36-37 at idle up to 47ish at wot.
I would be getting to the bottom of this issue first. Then re-evaluate where your at.
I thought it was more like 36-37 at idle up to 47ish at wot.
I would be getting to the bottom of this issue first. Then re-evaluate where your at.
Thread Starter
TheCorvetteBen
Joined: Feb 2007
Posts: 4,987
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From: Van Alstyne, TX
I'm going to try to verify with another fuel pressure gauge if I am reading this right. I also figured out that this gas is literally a dark yellow color so it might be bad gas as well.
Race Director
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From: Lansing MI
Gas is basically yellow. Some might call it gold color. Take a picture of the gauge with it connected properly and the engine running at idle, then post it here in the event you want further confirmation.
Thread Starter
TheCorvetteBen
Joined: Feb 2007
Posts: 4,987
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From: Van Alstyne, TX
The gauge was connected properly. It is pretty hard to mess up putting a gauge onto the shrader valve. I will try renting one from autozone tomorrow and see if that one reads differently.
Race Director
Joined: Oct 2008
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From: Lansing MI
Mines not all that easy. There's half a dozen adaptors for several different manufacturers and the gage itself clips to the adaptor after it has been threaded to the fuel rail. Snap-on is the vendor. I don't love it.
Thread Starter
TheCorvetteBen
Joined: Feb 2007
Posts: 4,987
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From: Van Alstyne, TX
The one I have screws to the fuel rail over the shrader valve and that is it.
Racer
Joined: Mar 2016
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From: Flowood MS
Keep us posted. I'm going to be sad and happy if your gauge was off and you rebuilt your fuel system unnecessarily. If it's the Opti, at least you will know the cause.
So next 'Vette Collectors edition LT4, LT4 or ZR1? If I'm going to spend over 15K I'm going to get the ZR1 and not a GS.
Racer
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From: Flowood MS