fuel pump problem
05-16-2011, 10:45 PM
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fuel pump problem
Hey, I have a quick question I need help with. I tried to start the boat today and it wont go. I can usually hear the fuel pump prime, but nothing when the key is turned on. It is a 4.3 Volvo. So I tested for power at the fuel pump connection and nothing. I tested down to the relay and it has 12 volts. I swapped relays with no luck. The dead man switch has already been bypassed. I ran power straight to the pum and it turned on. I'm at a complete loss. I know it's something simple I'm missing. I put a little fuel into the carb and it started right up. Ideas? Thanks
05-17-2011, 07:10 AM
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Just checked to make sure and the guage is showing oil pressure when the key is turned on. Oil is in the good range on the dip stick. What next? Thanks alot.
05-17-2011, 07:20 AM
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I would start by checking for continuity in the wires between the pump and the relay. Might be a loose connection, broken or corroded wire. Do you know for sure that the relay you tried was good ? 
05-17-2011, 02:35 PM
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on most of those the pupm runs for 5 secs when the key is first on then shuts off and then waits for a tach signal or oil pres signal for the pump to restart. but the boat should still start. if the pump spins then it should build pressure in the rail and thats all it needs. if the fuel press gage says zero , its not going to start. if it says 38 or so it should start if everything else is good. you need to know if you have fuel pressure in the rail... thats the first thing
05-17-2011, 05:09 PM
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I'm lost here...I thought he said he had a carb ? 
if the pump spins then it should build pressure in the rail and thats all it needs. if the fuel press gage says zero , its not going to start. if it says 38 or so it should start if everything else is good. you need to know if you have fuel pressure in the rail... thats the first thing
Last edited by tinman565; 05-17-2011 at 05:12 PM.
05-18-2011, 09:06 AM
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geeze youre right. i saw the " fuel pump prime " wording and assumed injected. well advice still applies i guess... confirm fuel press at the carb with the gage... if its there should be able to pump the throttle a few times and have it start... wouldn't you think ?
