Volvo Penta 570 stalls at idle when warm

[seawbryant51]

'92 Volvo Penta 570 1100 hours
Rochester carb

Purrs when <140 degrees or at 2200 RPM when cruising.

It stalls out (like a vapor lock) and will not restart until it cools down. It is not getting fuel under these conditions.

Fuel/water separator replaced, basket filter at carb intake clear.

Suggestions? At whit ends.

Thanks

 

[captmello]

Re: Volvo Penta 570 stalls at idle when warm

Welcome to Iboats.

Is your choke working correctly? Fully open when warmed up?

Have you poured a little gas into the carb when this happens to see if it will run that way?

Give the other guys a chance to wake up a bit.

We'll get it figured out.

 

[Don S]

Re: Volvo Penta 570 stalls at idle when warm

It stalls out (like a vapor lock) and will not restart until it cools down. It is not getting fuel under these conditions.

I would have to ask how you know that it is a fuel problem? Have you operated the throttle and checked the carb to see if fuel comes out of the accelerator pump? Do you have fuel pump pressure? Have you checked?

When the engine dies, have you checked for spark to make sure you don't have an ignition system failure somewhere?

It is very possible that you have a fuel problem, might want to go up to the Adults Only sticky at the top of this forum and look at the link on How to test your boats fuel system. You may have issues with the pickup or vent being plugged.

 

[seawbryant51]

Re: Volvo Penta 570 stalls at idle when warm

Yes Captmello, if I pour a bit of gas in the open choke, it'll start.....something in the temperature is limiting the fuel....

 

[captmello]

Re: Volvo Penta 570 stalls at idle when warm

Hummmm....

Well you'll have to go through it systematically.

Your explanation of the symptoms is a bit vague. Do you reach WOT? 140 is not really operating temp but your guage may be wrong, who knows.

The boat dies when you bring it down to Idle? Describe a typical situation in detail. Still not sure if the choke is opening.

Did the problem just start? A little maintenence history could be useful.

You do your own work?

Did you check out the Sticky that Don S mentioned. Are you able to test your system that way?

 

[chiefalen]

Re: Volvo Penta 570 stalls at idle when warm

Wish i had a dime for every time someone said the temp is limiting the fuel.

You sure it's the fuel ? Then here we go.

Clean the carb. take it off and get every little hole CLEAN. You do know how to do that ? If not post and i'll explain in detail.

Clean the filter in the fitting by the carb, the one in the fuel pump if you have one there, and the anti-siphon valve and screen on the fuel pickup.

You have a fuel water separator ? Dump it in a clear jar what do you see ?

Leave it for a while to see if there is water in the fuel and garbage.

Check the fuel pump for proper pressure, 4-6 psi if i remember right, no more no less.

Post back the result.

Good luck !

 

[seawbryant51]

Re: Volvo Penta 570 stalls at idle when warm

Cpt Mello--

...it purrs at 140 -- it croaks at idle at about 155....

Choke is operating, i.e., open as the engine warms....choke plate in carb is at vertical at 155.

Hear's the symptons...

A bit of a cold starter, but does start and runs perfectly until 155. At WOT it runs fine at 155....it is when I throttle down to idle (like coming into my slip) it up and dies and then won't start unless I pour fuel into the carb.

It was an intermittent problem...didn't use boat much last year and now it is an everytime occurence.

The engine did get a dousing of salt water in recent history as I had a leak from my water pump raw water intake for a couple weeks when the boat was being operated regularly.

The fuel water separator is changed regularly.

I do not normally do my own work but am out of work right now and unable to hire a mechanic.

The next posting brings up something that might lead somewhere....about 7 years ago had a fuel flow problem and the mechanic pulled the anti-syphon valve (thing with a ball and a spring it it was sticking...unable to find a replacement part as I recall)....the engine causing the current difficulty is running on the tank that still has an anti-syphon valve in it....maybe not enough fuel syphon pressure to move the valve at idle speed....

The boat is 75 miles north and will check this next....

any other suggestions?

------------------------------------------------
Well you'll have to go through it systematically.

Your explanation of the symptoms is a bit vague. Do you reach WOT? 140 is not really operating temp but your guage may be wrong, who knows.

The boat dies when you bring it down to Idle? Describe a typical situation in detail. Still not sure if the choke is opening.

Did the problem just start? A little maintenence history could be useful.

You do your own work?

Did you check out the Sticky that Don S mentioned. Are you able to test your system that way?[/QUOTE]

 

[Don S]

Re: Volvo Penta 570 stalls at idle when warm

If it runs ok at intermediate throttle and full throttle, sounds like it's time for a carb rebuild to me.
But I would sure do that fuel system check before rebuilding. Have you looked at the test yet? No mention of it.
http://forums.iboats.com/showthread.php?t=283269

 

[LBG]

Re: Volvo Penta 570 stalls at idle when warm

Hey seawbryant51,
Did you ever resolve this issue?? I'm having the exact problem with my AQ271A.

I think it's an ethanol fuel related issue and am going to get the tank cleaned and then replace fuel lines and filters.

I'd appreciate any comments on what worked for you.