Rude 90HP V4 ( 2 Small Issues )

[StingRay_90V4]

Thanks to everyone who has given me advise so far. I seem to have my new boat working really well so far except for two last small issues I was wondering if anyone could help me out trying to figure them out. The motor runs great. And feels strong. The boat planes really well and I couldn't really ask for too much more top speed I don't think. It will always hit 38mph at the low of top speed if the lake is really rough and the weather is windy. Any other day it will always hit 39mph and sometimes hit 40mph when the laske is calm. It is doing about 5500-5700rpm at wot. Which is great. My questions are ,


1. The pump bulb from the gas tank seems to loosen up from time to time and the motor seems to loose prime on the gas tank. And will seem too loose fuel and power untill I pump the bulb and then it takes off and all is good for awhile. Sometimes only 5-10 minutes. Sometimes for the rest of the tamk of fuel. Any idea what could cause the bulb to loose pressure ?



2. When the engine first starts. It starts farily easily. And idles great. But when you put it in reverse or even forward. It will sputter and die. Even if you try to use the nuteral rev/chole lever. As soon as it goes to rev up at all it will just die right away. But yet it will start great and idle perfect no problems if at all and not stall at all if you just let it idle for like say 4 minutes. Then , it will rev no problem at all. Instintly revs, and will go into forward or reverse with zero issues. It just seems to be a issue for the first few minutes untuill it warms up part way . Is there something that needs to be adjusted to allow it to take fuel while it is just started and warming up ? It is great and runs strong once it is runnimg for 5 minutes tops.


Thanks for any help !

 

[StingRay_90V4]

Any thoughts at all ?

 

[JDusza]

Yup.
For 1.: There are a couple things that can cause this. You may have an air leak somewhere in the inlet fuel line before the carburetor. Right now, the entire length of the fuel line is suspect, from the fuel tank line connection to the carburetor. Somewhere there is an air leak. Or, the fuel pump is malfunctioning. When you check the fuel pump you do not want to take any chance that the engine will start. Remove the spark plugs. Check the fuel pump by disconnecting the fuel line at the carburetor and wrapping it in a rag, spin the crank and fuel should be pumped, spurting into the rag.
For 2.: You are probably correct that it is warm-up related. You may be able to marginally improve the situation by enriching the low speed fuel mixture. It may be a little lean for the starts you want. My guess is you will be able to enrich the mixture without feeling any other ill effects.
Good luck.
J

 

[emdsapmgr]

The bulb should pump up hard when first starting at the beginning of each day. Once the engine runs and draws fuel through the bulb, it will get softer, but should not collapse on itself. That's normal. If the engine runs well for long periods at WOT, the fuel pump is likely ok. A cold engine needs to be re-choked every 5-10 seconds till the engine warms up after maybe a minute or two. Once it's warmed up it should run ok the rest of the time. If the idle rpm's are too low, it can cause problems when shifting or stalling. Set the idle to 650-700 rpm's when in the boat is floating normally in the lake and it's in forward gear.

 

[StingRay_90V4]

So sounds like I need to pick up a new fuel line and pump bulb. And as far as the stalling. Does the lean adjustment adjust at the carberators ? Thanks...

 

[JDusza]

Oops! Don't run out for a fuel line yet. You should check the rest of the fuel line circuit, for instance, a leaking in-line fuel filter can cause this. Check the entire fuel line system before you commit to buy. If you buy a fuel line, you may still miss the real issue. Just sayin'...
J

 

[emdsapmgr]

You really need to tell us what engine this is. OMC made both a 90 degree crossflow engine and a 60 degree looper in the 90 hp configurations.
There are major differences here. If you don't know the year, pls post the model number on the engine, as some years OMC made both of them concurrently.

 

[StingRay_90V4]

I will get the model number for sure . I am interested to know which engine design I have . What are some of the differences between them ? And are there any performance or durability differences between them at all ?

 

[StingRay_90V4]

The model number is VE90TLESB . Based on that can anyone tell me is it is a crossflow 90hp or a looper 90hp ? And what are the differences ? Also , what year is the motor ? I think it is a 1990 .

Thank you

 

[racerone]

What are the results of a compression test ?

 

[StingRay_90V4]

I don't understand what a compression test has to do with the model number and if its a cross flow or looper ? I haven't done a compression test because frankly the motor performs excellent. And at 40+mph I'm sure its fine. I have adjust the carbs at idle and it seems to be fine now when first started with faking fuel. And I will be getting a new fuel line , pump bulb and may e new gas tank to rule out those for the lose of pressure after a while running. As well as a new diafram for the fuel pump . I was just wondering on the model number I provided if my motor is indeed a 1990 and a cross flow or looper ? Thank you !

 

[racerone]

It is a crossflow.

 

[Schmie98]

Had a similar issue with my 1997 90 a few years back. Once she got running, things were smooth. That lasted for several outings and the problem got a bit more worrisome. Took it to a friendly mechanic who diagnosed a sticking throttle body (flooding at times, lean at others). Cleaned it up and things have been running smooth ever since.