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Old 04-12-2016, 08:18 AM   #1 (permalink)
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Default F6A No Power

My truck has an F6A engine. Was having problems with excess gas and the engine smothering down when I went through mud. Changed the carburetor with an aftermarket one. Engine still smothers down when I put it in gear and try to move. When I rev the engine it hesitates to take the fuel. But by pumping it, I can get it to fast rpms. What is up? Again, I am knew to this and do not have anyone in my area that works on these trucks.
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Old 04-12-2016, 07:50 PM   #2 (permalink)
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Greetings!
Fuel filter changed?
Air filter changed?
Fuel pump has good output?
Muffler not blocked?
Good luck.
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Old 04-13-2016, 09:41 AM   #3 (permalink)
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Thanks! I know the exhaust is good and air filter is new but will check for obstruction in hose. Have not looked at fuel issue. Will get back to truck in a couple of days. Thanks again.
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Old 04-18-2016, 09:36 AM   #4 (permalink)
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Changed the fuel filter. It needed it. Seemed to help a bit but still not right. It runs really rough when started but seems to level out in a few minutes. When I depress the accelerator slowly, the engine revs up until I get to about 1/3 throttle, then it chokes down. Also I advanced the distributor as far as I could and that seemed to help. I replaced the vacuum lines too. Is it just an adjustment issue at this point? Thanks again for your help.
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Old 04-18-2016, 03:24 PM   #5 (permalink)
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A failing fuel pump is a distinct possibility. It still sounds like it's not getting enough fuel. Check the pump if you haven't already.
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Old 04-19-2016, 08:24 AM   #6 (permalink)
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Thanks, I did some adjusting on the carburetor and ended up retarding the distributor and it is running better. Still not right, but much better. How do you check fuel pump?
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Old 04-19-2016, 08:42 AM   #7 (permalink)
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I think on a lot of these Suzuki trucks/vans it's mounted near the battery (at least on carburetor models) and when the ignition is on will make a constant ticking noise if it is pumping. You could also try disconnecting the fuel hose going to the carb and sticking it in a glass jar and seeing how well fuel is pumped into it (Obviously don't do this while the engine is hot, to reduce the chance of fuel spillages causing a fire!).
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Old 04-19-2016, 09:39 AM   #8 (permalink)
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I have an aftermarket fuel pump near the tank. When I turn the key on, I hear clicking for a few seconds. I did take the fuel line off the carburetor and there was no fuel coming out. I tried spinning the engine and fuel pumped as long as the starter was engaged. When I released the starter, the fuel stopped following. Is the fuel pump bad?
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Old 04-19-2016, 01:33 PM   #9 (permalink)
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That sounds like a safety switch so that the fuel pump only runs when cranking or if the engine is running. The Indonesian Suzuki Carry I've worked on doesn't have that feature (It just keeps pumping forever when the key is on, lol) as long as the pump is working while the engine is running it should be fine. Maybe the float height in the carburetor needs adjustment?
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Old 04-19-2016, 02:03 PM   #10 (permalink)
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Thanks, I appreciate your time and expertise. I will eventually get this right. It has been a long time since I have worked on an engine.
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