I am pondering over fuel
******** I found out today. Originally, I was about to pull the water
pump because of a slow leak. To do this, I had to pull out my day tank to get access to said pump
. While doing this, and peeking into the tank seeing "dark" fuel
, I came up with the idea of changing my two in line racor
fuel filters, which turned out to be both black as the devils wallpaint. So I went on on this route
, and got a fuel sample out of my main tank and one out of my day tank.
So, forget about the raw water pump
. Here's my fuel set up (Gulfstar 37 with a Perkins
1.) 35 gallon Main tank is disconnected from any engine
fuel lines and solely serves the day tank through a racor
10 micron filter by a manually activated electrical fuel pump
. (Was installed as a "quick fix" to a bad case of diesel
2.) From the 13 gallon day tank, the major fuel line to the engine
goes through two more Racor 500 filters, 30 and 10 micron, serving as secondary and primary fuel filters. The primary fuel filter
on the engine has been removed. There is an electrical fuel pump
that feeds directly into the injector / high pressure pump
3.) The engine returns excess / surplus fuel to the day tank.
So my fuel samples came out quite different than I thought: The allegedly contaminated main tank fuel sample came out pristine clear, the day tank sample came back black. Like, black.
Also, I've been low on oil
just in the last months. The engine seems to eat oil
faster than I was used to. I'm not "making" oil, and the dipstick sample is thick and looks as usual, so I assume no diesel
gets into the crankcase? To me it seems, the surplus fuel comes back contaminated with what I think is engine oil. 15W40. What-the-eff?
seems super fine, engine always starts right away and runs smoothly, so I kind of tend to rule
out bad rings.
What else would turn my fuel into black goo? Mind you, the main tanks
diesel is fine and clear.
Thank you for any input or ideas!