V195 Engine Troubles

[fireman24mn]

1975 V 195 It has a Ford 302 and Volvo drive. About 2 years ago I developed a sporadic problem where the engine would die. It starts and runs fine. Then after driving above 3,000 rpm for a little while it will suddenly sputter and die like you are turning the key on and off. I can pull the throttle into neutral and it starts right back up with no cranking, just fires right up. I can do this before the boat even comes off of plane. Then hit the throttle again and away it goes for about 2-300 yards then will do it again. It only seems to do it when it is in gear on plane at above 3,000 rpm. Sometimes if I pull the throttle back quick enough it wont die, then I can take off again and it will do it again in about 200 yards. In Neutral at the dock it will sit and run over 3,000 rpm without a problem it seems( unless I just have run it long enough at the dock..

So far I have installed a new HEI style distributor (removed old points style system, no change in problem), different fuel pump(no change), test the fuel pressure (stays the same 4psi when it dies), tried running from a different fresh tank(to rule out water contamination), checked timing, opened up the carb(looks clean) looked at fuel filter(good), tried wiggling the key when it is dying to see if that would make a difference(it didn't). We also ran across the lake with the timing light hooked up to see if the spark would shut off and it did not seem to.

I am out of things to try.  As I said when it dies it immediately fires right back up no cranking or pumping the throttle. The warmer the engine gets it seems to get a worse, meaning does it more frequently.

Anyone have any Ideas?

[thedeuceman]

My new boat with the 351 has the same carb, I have to pull the motor to put a transom in it, you're welcome to borrow the carb just to eliminate  that


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[Oldfishguy]

Maybe the wiring on the kill switch, or the switch itself.  If the fuel pressure is solid, I'm thinking electrical.

[75starflight]

Shawn, have you checked to see if the back side of the key switch is getting hot it self?
We have ran into a few issues recently at my work where old wires on some tractors had built up some resistance causing electrical issues.

[Jason]

I'd try bypassing all wiring going to the ignition system. Hot wire it with a toggle to the battery. This will eliminate any of the boat wiring from being the issue. Do Volvo's have a shift interrupt switch? Maybe that is sticking.

if that does not work out it has to be in the carb. Sounds like it sputters then shuts off. Kind of sounds more like fuel to me. If it just quit like hitting a switch I'd say electrical.

[Plugcheck]

     I would second Jason's suggestion and tie a hot wire to the ignition for a test.   Is there an idle circuit cut off valve on that particular carb?  A simple solenoid to cut off fuel used to keep engines from "dieseling" when you cut off the fuel(turn off ign).   Seen it happen on an old mustang, the float got contaminated over the years, swelled, and would simply stick from time to time, did not find the issue until after trying a buddies carb. 

 More than likely likely its the Ford/Volvo combination, we bowtie/Mercruiser folks don't have these issues-ha ha

[fireman24mn]

Joe yes I say lets try the carb

Jason that is another good Idea. Volvos do not have a interrupter switch.

Mike It is a 2 barrel rochester carb not sure if it has that in it or not. I'm not a ford or Volvo fan by the way.

[Plugcheck]

Given that you have changed the ignition leads me to suspect the carb more.  Being able to start back up easily after it dies somewhat checks the idle circuit, but stumbling and dying at 3000 rpm is past the transition and into the main circuit.  I would pull the carb and check for obstructions in the fuel input through the main jet/booster.  As with most carbs, the fuel mixture is affected greatly by the level in the fuel well.

[fireman24mn]

We pulled the top of the carb and it looked good in there. I think we might try and bolt Joes carb on it and see what happens. Otherwise I may just list it for a cheap price and get rid of it. I only use it once or twice a year and then winterize it and pay to store it. Pluss I have to move it to mow around it every other week.

Anyone want a good deal on a V-195?

[rheine]

I had the same symptoms with two boats in the past. Mine turned out to be a fuel vent issue in one and a filter. I could Sunday drive all day but once I opened it up it ran 100 yards and died.  It would always start back up. At first I thought fuel pump or carb filter but they were fairly new.  I found a filter on the tank draw tube that was pretty messed up and the tank was full of stuff that could suck up onto the filter and plug it after a while. Cleaned and fixed.

[fireman24mn]

We checked the filter that is at the carb and it looked good. We also completely unhooked from the tank & tank filter then just ran it from a gas can that had fresh gas. Still had the same problem.

[rheine]

Tested the mechanical fuel pump?

[fireman24mn]

we replaced the Mech pump and also test the line pressure right at the carb. It never dropped stayed steady at 4 psi

[FergusonPooleInc]

Hello,

An anti-siphon valve, which looks like a hose barb outwardly, and where the rubber hose attaches at the fuel tank, can exhibit some very strange symptoms.  You might either want to replace it with a plain hose barb for testing, or install a new one.

Regards,
Joe
www.fergusonpoolemarine.com
info@fergusonpoolemarine.com

[Plugcheck]

      We had a boat with that fitting, and it went bad, causing a fuel starvation issue at the carb.  I considered that, but he reported that fuel was available, and fuel pressure remained 4psi when the engine would die.   Our fitting required removal at the tank, then punched out the ball and spring making it straight through.  We always assumed it was like a rollover valve.   the spring got weak, and the ball would stick occasionally. I suppose its worth checking, but I cannot see why you would still have pressure if it was bad.  Let us know, kinda curious now.

[fireman24mn]

No anti siphon valve in my tank it was a straight threw pipe/ fitting

[Plugcheck]

Time to borrow Joe's and see the results.  Ignition cannot be ruled out, but 2 barrel Rochester's are easy to go through.  Having a good pump and pressure has little to do with volume of fuel, can send ya on a wild goose chase.