Chevrolet Repair Questions? Ask a Chevy Mechanic for Answers ASAP
Hi there, I am Cam. Can I get your name please? Can you tell me when you replaced the fuel filter last?
Ok, what is the pressure doing when this happens?
I am wondering if even though the filter is new, that there is a pump/pressure issue. At idle the pressure drops and causes this. We could also try now cleaning the throttle body and Mass Air Flow sensor (MAF) sensor with carb cleaner and then reset the system. Take the battery cables off the battery, hold the ends together for 10 seconds then attach them to the battery and see what happens. This will reset the whole vehicle.If you have 2 batteries, then remove both and touch only one set.
If this does not then it may be that the fuel pressure regulator is failing/leaking. Yes you can drive with the dog house off for a bit. It will just be noisy.
OK,. Also make note of idling pressure, pump only pressure and how long it holds with the key turned off.
Ok, the only number that concerns me is it dropping to 0 that fast. It should hold and drop only 5 psi in 5 mins from the 53 psi. I am wondering if the regulator is leaking inside the intake or the map or mass air flow sensors are bad.
Right. When the pump stops, it should not drop more an 5 psi in the first 5 mins. If it does then the pump's check valve or fuel pressure regulator is leaking.
So next we pinch the return line. If the pressure still drops, it's the fuel pump mid not then the fuel pressure regulator.
those codes all point to low pressure so I think we have to look at the issue as being the pump or regulator.
Replace your fuel pump. It is failing internally.
, Yes, we need to chase what we see as bad, and that I am 100% positive is bad. And feel its 90% likely to fix your issue.
Exactly. Many people think it means vacuum leak, and that is possible, but lean can and often is not enough fuel.
Possibly yes. That is the one part that does not fit as neatly into the mix. Hard start hot is usually leaking injectors or leaking fuel pressure regulator. Can you smell raw gas in the intake if you open the throttle plate and smell down in there?
Yes, the one test about pinching the return line does not rule out external leaks.
Unlikely. The more we talk, the more I think about it, I would take the upper intake off and reconnect the fuel lines, then simply power up the pump and see if fuel leaks from the regulator. This way you can tell with out replacing anything just yet.
Replace the regulator.
If not then the fuel pump.
Yes, that’s what I believe it is.
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