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No Start - Fuel Related
I had the car out running around about 3 weeks ago, then went to start today and nothing. Any help diagnosing is appreciated.
The Car: 1970 911t 2.2 with Webers Fuel Pump located just outside the tank. New Fuel Filter in the engine bay. I pulled all the plugs to check for spark and clean them. I have an inline guage just downstream of the fuel filter, before the fuel lines split going to each carb. The pressure is steady at 3 psi, regardless of throttle position. I put fuel in the horns to verify the car will run and it worked. Assuming the fuel pressure is acceptable, it seems the issue must be in the short line runs between the fuel pressure guage and the carbs. Also, part of that run is rigid line. |
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Fleabit peanut monkey
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Is three psi normal or acceptable? I know (think) the old ones are less than CIS but three seems pretty wimpy.
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1981 911SC Targa |
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If memory serves, 3-5#'s is what Webers like.
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So I verified fuel is getting to each carb, whether or not its enough I don't know.
Regardless, I should be able to see fuel pouring in carb while looking down the horn with the fuel pomp running, right? My internet is down so I can't look at the Weber diagram on this little phone. |
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Fleabit peanut monkey
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You are right, Bro. I did some searches and 3-3.5 is correct. Sorry about that. I am used to CIS with monstrous pressure.
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1981 911SC Targa |
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No worries. Its all part of the enjoyment of ownership. Thankfully there is tons os knowledge on this awesome forum.
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I'm still confused why the float bowls aren't filling up.
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On some Weber set ups there are filter screens in the fuel entry banjos (on the carburetors). You will need to remove the banjo bolts check the screens. Place a container under the banjos while someone turns on the ignition. If no fuel passes through the banjos, then your fuel pump isn't working or your fuel filter is blocked. No, there should not be fuel appearing down the throttle throats unless you operate the throttle linkage.
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Porsche, aucune comparaison |
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I pulled the banjos, looked/cleaned the screens but didn't check flow at that location because I check for flow just before the line enters the banjo. There was flow just before the banjo at each carb. Also, there is no visible fuel down the throat when the throttle linkage Is actuated.
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I pulled the banjos again and made sure there was flow. Still no avail. Is there a chance both sets of carbs have stuck floats?
Maybe the pump can produce some pressure, but under load can't flow? |
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