Ralph has some good strangulation pictures - some place.
Graaaaaaach ! ! !
Ralph has some good strangulation pictures - some place.
I have seen a Racor filter clog within one hour with water and sediment. In 20 hours things can happen. Just drain the water separator and inspect the filter cartridge . Check the Microns size on that cartridge; the use of 2Micron cartridges quite often result in constrained fuel flow if there is sediment in the tank. It is also redundant as the secondary filter is usually a 2 Micron to get the smaller particles. Recommend the use of a 10 micron for the Primary filter. Check the vent to the fuel tank, sometimes critters nest in there and block the free flow of air needed. You may also check the fuel flow at the lift pump, a perforated diaphragm may reduce fuel flow. Check for any fuel leaks at the pump or fuel lines. Wherever fuel leaks out, air can leak in and air can cushion and reduce fuel pressure. It can sometimes be hard to properly bleed the air out of the fuel lines in these Yanmar engines, air can get trapped, so repeating the procedure a couple of times sometimes is necessary. You may also turn the Prop shaft by hand to see if turns smoothly or if an undue resistance is present. Lastly start the engine and remove the oil cap, hover your hand over the opening and feel the back pressure, it should be a steady tapping feel but if you feel hard thumps it means excessive compression is being lost as it blows by the piston rings. Sometimes the use of too thin a motor oil can cause blow-by, in contrast using a thicker SAE oil can usually increase the compression of a tired engine. I suggested it before, check the valves lash as it will affect compression. Check the air intake tube and air filter for obstruction or clogging. Do not discount anything even though you may feel they should be good, go back to the mixing elbow, filters, linkages etc. until you find the culprit.I agree with his theory about clogged filters causing low power issues, but I’m having a hard time wrapping my head around both filters clogging with less then 20 hours, and when I emptied my fuel tank and refilled it the old fuel and new fuel was clean.
Or, he could have done what I suggested and purchased a small plastic gas can at Home Depot or Pep Boys for ~$15 to use as a temporary tank, together with two pieces of new fuel hose (one for pickup and the other for return), and bypass the tank and the pickup tube altogether. As it is, I think it's dubious that he has truly eliminated all the possible issues with step 3.Number "3" how did you check?
A negative pressure would indicate m a clogged pickup tube screen, you can blow through it and maybe loosen the stuff that's coating the bottom of it but it probably will return. see if you can remove the pickup tube to physically check (if you haven't already) but it looks like you're getting close to solving the problem!
And for this you quoted me?Or, he could have done what I suggested and purchased a small plastic gas can at Home Depot or Pep Boys for ~$15 to use as a temporary tank, together with two pieces of new fuel hose (one for pickup and the other for return), and bypass the tank and the pickup tube altogether. As it is, I think it's dubious that he has truly eliminated all the possible issues with step 3.
Sorry you took offense at this. None was intended.And for this you quoted me?
It's called a day tank and I just happen to know what you're talking about but he wants to troubleshoot his fuel system either way. Maybe you should quote some other people giving advice too because they may feel left out...
I appreciate your graciousness, Denise.No offense really it's just comical to me that almost always I'm the only one that gets quoted on these discussions, my boat is probably going have in the same problems it's a1986 H34. First issue is to deal with the forward aft bulkhead underneath the cockpit because no matter how I try it's going to be very painful for me to crawl in to the lazarette.
I can't imagine any old fuel tank not having sludge in it, been there done that with my Oday 30,