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#1
11-13-2007, 03:00 PM
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280 4.5 fuel pressure
Can anyone tell me what the correct fuel pressure is for a 1972 280 4.5.
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#3
11-13-2007, 07:22 PM
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It was reading 30 psi but it ran weak and lean. I adjusted the pressure to 35 psi and it ran alot better with way more power. Am I overlooking something else that might be causing low power and popping back though the throttle body during acceleration?
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#4
11-13-2007, 08:37 PM
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Could be ignition.
Could be clogged injectors (hence why more pressure helps) Usually it's ignition. Is your timing spot on 5°ATDC with the vacuum connected (7°BTDC without it)?
__________________
Current: 2021 Charger Scat Pack Widebody "Sinabee" 2018 Durango R/T Previous: 1972 280SE 4.5 2014 Jeep Grand Cherokee Limited "Hefe", 1992 Jeep Cherokee Laredo "Jeepy", 2006 Charger R/T "Hemi" 1999 Chrysler 300M - RIP @ 221k
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#5
11-14-2007, 04:01 PM
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Stan:
Did you connect the pressure gauge properly? Per the manual, it is supposed to be connected into the cold start valve supply line with a TEE fitting. Adjust the regulator to get 2 bar pressure with the engine running. 230/8
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#6
11-14-2007, 07:39 PM
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The correct pressure is 32psi. When you switch off the pump, the presure should hold. Not necessarily forever, but it should not drop immediately. -CTH
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