Had a fuel system problem due to regulator
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Joined: Feb 2008
Posts: 4,508
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From: VA
Had a fuel system problem due to regulator
Got out for a spin and 7 miles from home engine acted up like it was flooding, loading up. Noted that the fuel air was very lean up to 17:1. If I reved engine in neutral could keep it running mostly, and waiting out lights required many restarts. Limped home and remember that if you restart car in neutral while rolling, that transmission will NOT REENGAGE until the wheels stop turning.
Got home, checked RCM, contacts were clean, put it on lift and noted pump was warm???? Pulled wire to pump, and fed 12 v from battery sitting on floor, and noted that the regulator gauge was reading 80 psi. Adjusted the regulator back to 60+ psi,pump cooled and you could hear the fuel circulating to the tank.
Seems that the high flow pump and adjustable regulator had stalled due to high pressure. I suspect the AEM regulator took an attitude and stuck in position blocking the bypass. This is something I will monitor on my dash DAC, I have had a fuel pressure sensor but did not have it displayed previously. With all the testing and design that I have done to the car, this caught me off guard, and I wanted to pass this issue on for others to be aware of. Using other gauges on the fuel rail, I saw that the real pressure was nearer 100psi.
WIth all the fuel pressure how did I get lean??? Pump was stalling and the fuel pressure was going to zero after driving for a while. Testing under the car did not heat the pump up enough sitting still, but the pressure issue was more than apparent. Lesson learned, watch your gauges, enjoy, W
D Y
Got home, checked RCM, contacts were clean, put it on lift and noted pump was warm???? Pulled wire to pump, and fed 12 v from battery sitting on floor, and noted that the regulator gauge was reading 80 psi. Adjusted the regulator back to 60+ psi,pump cooled and you could hear the fuel circulating to the tank.
Seems that the high flow pump and adjustable regulator had stalled due to high pressure. I suspect the AEM regulator took an attitude and stuck in position blocking the bypass. This is something I will monitor on my dash DAC, I have had a fuel pressure sensor but did not have it displayed previously. With all the testing and design that I have done to the car, this caught me off guard, and I wanted to pass this issue on for others to be aware of. Using other gauges on the fuel rail, I saw that the real pressure was nearer 100psi.
WIth all the fuel pressure how did I get lean??? Pump was stalling and the fuel pressure was going to zero after driving for a while. Testing under the car did not heat the pump up enough sitting still, but the pressure issue was more than apparent. Lesson learned, watch your gauges, enjoy, W
D Y
Senior Member
Joined: Apr 2010
Posts: 2,404
Likes: 8
From: Mendocino, CA
Re: Had a fuel system problem due to regulator
Got out for a spin and 7 miles from home engine acted up like it was flooding, loading up. Noted that the fuel air was very lean up to 17:1. If I reved engine in neutral could keep it running mostly, and waiting out lights required many restarts. Limped home and remember that if you restart car in neutral while rolling, that transmission will NOT REENGAGE until the wheels stop turning.
Got home, checked RCM, contacts were clean, put it on lift and noted pump was warm???? Pulled wire to pump, and fed 12 v from battery sitting on floor, and noted that the regulator gauge was reading 80 psi. Adjusted the regulator back to 60+ psi,pump cooled and you could hear the fuel circulating to the tank.
Seems that the high flow pump and adjustable regulator had stalled due to high pressure. I suspect the AEM regulator took an attitude and stuck in position blocking the bypass. This is something I will monitor on my dash DAC, I have had a fuel pressure sensor but did not have it displayed previously. With all the testing and design that I have done to the car, this caught me off guard, and I wanted to pass this issue on for others to be aware of. Using other gauges on the fuel rail, I saw that the real pressure was nearer 100psi.
WIth all the fuel pressure how did I get lean??? Pump was stalling and the fuel pressure was going to zero after driving for a while. Testing under the car did not heat the pump up enough sitting still, but the pressure issue was more than apparent. Lesson learned, watch your gauges, enjoy, W D Y
Got home, checked RCM, contacts were clean, put it on lift and noted pump was warm???? Pulled wire to pump, and fed 12 v from battery sitting on floor, and noted that the regulator gauge was reading 80 psi. Adjusted the regulator back to 60+ psi,pump cooled and you could hear the fuel circulating to the tank.
Seems that the high flow pump and adjustable regulator had stalled due to high pressure. I suspect the AEM regulator took an attitude and stuck in position blocking the bypass. This is something I will monitor on my dash DAC, I have had a fuel pressure sensor but did not have it displayed previously. With all the testing and design that I have done to the car, this caught me off guard, and I wanted to pass this issue on for others to be aware of. Using other gauges on the fuel rail, I saw that the real pressure was nearer 100psi.
WIth all the fuel pressure how did I get lean??? Pump was stalling and the fuel pressure was going to zero after driving for a while. Testing under the car did not heat the pump up enough sitting still, but the pressure issue was more than apparent. Lesson learned, watch your gauges, enjoy, W
D Y
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