Need to install an electric prime pump

took me a year to debug air coming in my prefilter on my yanmar generator. Turned out I just needed to tighten by half a turn the circlip on the prefilter inlet hose. Never saw a single drop of that hose, all bone dry...
You know where the problem is, take it all apart, figure out how exactly it works, screw it all back together carefully and tightly with new o-rings, will work!
 
Okay. Definitely will do.

Also, I still bought a bigger electric pump to have a try play around. The ideas are two:

1. As an emergency prime when an engine stop, such as mooring I like two engines easier.

2. Some time let the fuel overfeed as a fuel polish system.
 
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absolutely and definitely disagree!
YOU FIX THAT properly!
don't need a extra pump to do so!

you're going about a very absurd and distorted way to solve a simple problem. Just find and fix the leak, simple as that. Then forget all about it for good.
introducing an extra element into the system to cover up for a failure to find a problem is as wrong as I could ever think of approaching boating!
 
vas said:
absolutely and definitely disagree!
YOU FIX THAT properly!
don't need a extra pump to do so!

you're going about a very absurd and distorted way to solve a simple problem. Just find and fix the leak, simple as that. Then forget all about it for good.
introducing an extra element into the system to cover up for a failure to find a problem is as wrong as I could ever think of approaching boating!
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Vas is 100% correct. Just find the leak, an electric pump is a bodge, and totally unnecessary. When running, the engines circulate much more fuel through the prefilters than they need so you're already filtering it multiple times.
 
Start at the engine and work back to the tank .
It vacuum is sucking air in from a miss fitting . Probably at the highest point relative to the lower fuel level in the tank that’s why it’s not leaking as such .
 
Just came back from the boat. I removed and reassembled the pre-filter inlet brass pipe and add a few thread seal tape on it, then tighten the lid a bit more with a wrench. I think I fixed it this time as it is now no babble come out at all after I prime it many times for testing. Will give it a spin tomorrow. Looks like tomorrow will be a hot day like summer day again. Hooray!:cool:
 
Lucas Gan said:
Just came back from the boat. I removed and reassembled the pre-filter inlet brass pipe and add a few thread seal tape on it, then tighten the lid a bit more with a wrench. I think I fixed it this time as it is now no babble come out at all after I prime it many times for testing. Will give it a spin tomorrow. Looks like tomorrow will be a hot day like summer day again. Hooray!:cool:
Click to expand...
see, wasn't that difficult :rolleyes:
plus you save money for the next thing that's going to break down...
 
Close the tank tap then pressure the pipe from the lift pump you will then hear air escaping if that’s the case .
I don’t get why you would go to the expense of fitting an electric pump when your engine pump does exactly the same .
 
Thank you @vas. You are right.

@volvopaul. Just because I read a thread another day that said adding an electric pump can prime the system. I thought that will be good without going in and out of the tight engine room to prime it. Then I found an electric pump that won't prime the system at all. The fuel no any movement if only turn on the electric pump. The electric pump I added has 11 psi pressure, 33 gallons per hour capacity. No use at all, have to remove it today. Still need to use the hand prime pump.
 
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