The Boating Forum - F150 losing prime
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08-17-2012, 07:33 PM
After the motor sits for more than 24 hrs in order to start it I'm having to pump the primer bulb to stiffen it up with fuel. Never had to do this before. Any input?
Motor is a F150 2006.
install a check valve before the primer ball.
08-17-2012, 08:06 PM
check your fuel/water separator cannister/s and make sure they are screwed on firm with a good seal. Meaning rubber to metal and not rubber to crud and debris. I had similar situation and that was the problem. Check your fuel line hose clamps make sure they are good and snug. And also check hoses verify no holes/leaks...
08-17-2012, 08:13 PM
I have been having a lot of crud in my water/fuel seperator with rust forming in the top and this occured after it was installed for a wk. Under cowling filter is fine and otherwise the motor runs great.
08-17-2012, 08:40 PM
The bulb has a check valve built in I think so try replacing that. Easy and not much money so definitely worth a try.
Try to figure out what is causing the crud in the separator, that's obviously not good. If you don't have a good fuel filter than you should look at adding one. Dual batteries and a good fuel filter are the first things I add to a boat if it does not already have them.
08-18-2012, 05:56 AM
I have a 2006 250F. had the same problem. Don't be shocked, but, if you open the rigging tube from the motor to the primer ball, you might see a silcone fuel line that is split, cracked, and ethanol permiated. The fuel lines used prior to 2008 do not hold up to the long term affects of ethanol. If that is what you see, that is the first place that is causing you to lose prime. Of course do all the other steps; fuel water separator, filter under the cowl, and the replacing the primer ball. Also, if possible, try to postion the primer ball in an upright position, (arrow pointing upward). My boat originally came with a 30gph racor filter. I replaced with a 90gph yamaha fuel/water separator filter. Much better. If the above works, you are good to go. If you still have problems, then change the fuel line from the gas tank to the filter and remove the anti-siphon valve and throw it away. They do wear out and they do starve the fuel flow.
08-18-2012, 07:34 AM
Great advice. I'll start at the primer bulb and work from there.