Engine Maintenance... Problems

(dcooper) · (dcooper) **Join Date: Mar 2005** 08-14-2006, 11:34 AM

So, we have been having engine trouble, sometimes the engine gets bogged down when towing someone and slow to respond. Not consistenlty, the engines just seems under a bigger load sometimes than others. Nothing has changed, like weight or number of people.

The boat is 2001 Supra w/5.7 330hp indmar w/ 159hrs. Never done anything except oil changes and impeller change.

So is this a maintenance issue spark plugs, timing etc? Or do I have bigger or other problems?

(denverd1)

carbed?

(dcooper) · (dcooper) **Join Date: Mar 2005** 08-14-2006, 12:48 PM

No injected "MPI"

(rich_g) · (rich_g) **Join Date: May 2003** 08-14-2006, 1:14 PM

replace the water/fuel separator; could be clogged and its an easy thing to eliminate as a possibility

(trace) · (trace) **Join Date: Feb 2002** 08-14-2006, 1:15 PM

If you haven't lately, change your fuel filter and check / clean the pickup screen.

(dcooper) · (dcooper) **Join Date: Mar 2005** 08-14-2006, 1:21 PM

What is the pickup screen?

Is there a fuel filter and a water/fuel separator?

(trace) · (trace) **Join Date: Feb 2002** 08-14-2006, 1:35 PM

Not all boats have water separators, which usually look like big spin-on oil filters. The pickup screen is in the gas tank, on the end of the pickup tube.

(acurtis_ttu) · (acurtis_ttu) **Join Date: May 2004** 08-14-2006, 3:03 PM

Could have also just gotten some bad gas.

(dcooper) · (dcooper) **Join Date: Mar 2005** 08-14-2006, 3:10 PM

So, at this point it should not need to have a "tune-up" so to speak? Just check the filter and maybe run the gas out...

(trace) · (trace) **Join Date: Feb 2002** 08-15-2006, 6:33 AM

Your description sounds like fuel starvation or maybe bad gas to me. A "tune-up" on an EFI motor doesn't encompass much, these days - change the fluids, fuel filter, and maybe the spark plugs.

(denverd1)

sounds like fuel filter: trace the line from the tank. look for a fuel/water separator too

(fogey) · (fogey) **Join Date: Mar 2002** 08-15-2006, 9:29 AM

The fuel/water separator is probably at the front of the engine (nearest the transom) on the port side. As someone said, it looks like a large spin-on oil filter. It's not too hard to access, but you may need an oil filter wrench to remove it.

I think it also serves as the fuel filter, as I have not found any other fuel filter on my Supra.

(dcooper) · (dcooper) **Join Date: Mar 2005** 08-15-2006, 10:02 AM

Thanks, I'll check the fuel/water separator.