74 1.8 L-Jet No Run - Help Please!, No fuel out of injectors |
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74 1.8 L-Jet No Run - Help Please!, No fuel out of injectors |
SteveL |
Jul 18 2014, 10:26 PM
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#1
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Senior Member Group: Members Posts: 658 Joined: 7-August 03 From: Andover, MN Member No.: 991 Region Association: None |
74 1.8 with L-Jet
- Gas in tank - Key on and AFM flap moved with screwdriver, I can hear the pump run. - Removed fuel injector and placed in jar. Key on, moved AFM flap (can hear pump running), no fuel. Reconnected AFM to air intake and cranked it over (can't hear pump over starter), still no fuel in jar. Propped the AFM flap open, key on (can hear pump running), cranked it over, still no fuel in jar. Best I can figure, I think it must be one of the following: - plugged fuel filter? - fuel pump spinning, but not actually pumping fuel? - fuel pressure regulator? - injectors not receiving signal to spray? (IMG:style_emoticons/default/WTF.gif) Any suggestions? Thanks |
SteveL |
Aug 27 2014, 10:21 PM
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#2
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Senior Member Group: Members Posts: 658 Joined: 7-August 03 From: Andover, MN Member No.: 991 Region Association: None |
Update:
I checked all vacuum lines, tested the AAR and head temp sensor (ohm test). Verified the oil filler is sealed, and checked all the electrical connections. Everything looks good. I turned the key on and manually moved the AFM flap to engage the fuel pump. I still have the clear fuel lines in the engine compartment. As I hit the flap, I could see gas coming up a little bit in the clear supply line, but it did not flow (there was air uphill in the fuel line). The level only rose an inch or so, not all the way to the rubber hose. There was no fuel flowing in the return line. For a test, I bypassed the Fuel Pressure Regulator with the fuel line, and engaged the fuel pump again. I could see fuel making the entire loop through the return to tank line, and heard a mass of air bubbles getting pushed back into the fuel tank. I removed the Fuel Pressure Regulator. I cannot blow through it at all in either direction. Do I have a bad Fuel Pressure Regulator? Or, is it just that I cannot blow hard enough to open the valve inside? If that is the case, then neither can the fuel pump, and the fuel pump is bad, right?? Thanks |
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