Evinrude Etec Surging problem

[TheBoyScout]

Hey guys I recently bought a boat that came with a 2007 150 evinrude etec. Ive taken it out 3x now and it started surging more and more frequently. It would have great power then all of a sudden drop RPMS then back up and down, it even died once. While running, the primer bulb would go flat almost instantly and sometimes it felt like all I was pumping was air then randomly get fuel again. This makes me suspect that I have an air leak in my fuel lines but cant shake the feeling that its also one of my fuel pumps. I installed a clear hose with a primer bulb between the low pressure pump and fuel filter and had a steady stream of fuel being pushed out without air bubbles. Im planning on hooking it up to a clean portable fuel tank with fresh fuel and running it under load and see if I get any bubbles or bogging down.

If it still surges...
How would you go about diagnosing a low pressure fuel pump vs high pressure fuel pump?

Any help is greatly appreciated!

 

[acefuture]

Portable fuel tank will tell you a lot. But to check your pump the easiest way is to put in an in stream fuel pressure gauge and monitor it when it drops revs. Should be pinned solid at 60psi (just a number, what my pump runs at, might not be the same for you) for the entirely of while you’re on the throttle. If it dips you have a fuel pump problem. If it doesn’t, you’re getting air in your lines.

 

[firreal]

Sounds familiar, replaced fuel pumps and all the problems went away

 

[The Canvas Man]

Hey guys I recently bought a boat that came with a 2007 150 evinrude etec. Ive taken it out 3x now and it started surging more and more frequently. It would have great power then all of a sudden drop RPMS then back up and down, it even died once. While running, the primer bulb would go flat almost instantly and sometimes it felt like all I was pumping was air then randomly get fuel again. This makes me suspect that I have an air leak in my fuel lines but cant shake the feeling that its also one of my fuel pumps. I installed a clear hose with a primer bulb between the low pressure pump and fuel filter and had a steady stream of fuel being pushed out without air bubbles. Im planning on hooking it up to a clean portable fuel tank with fresh fuel and running it under load and see if I get any bubbles or bogging down.

If it still surges...
How would you go about diagnosing a low pressure fuel pump vs high pressure fuel pump?

Any help is greatly appreciated!

Try giving Ryan a call he use to be the E-tec specialist with Sunset marine. He has done wonders with my 250 and my neibors e-tex also
+1 619-322-9378

 

[TheBoyScout]

Portable fuel tank will tell you a lot. But to check your pump the easiest way is to put in an in stream fuel pressure gauge and monitor it when it drops revs. Should be pinned solid at 60psi (just a number, what my pump runs at, might not be the same for you) for the entirely of while you’re on the throttle. If it dips you have a fuel pump problem. If it doesn’t, you’re getting air in your lines.

Thanks yeah I will definitely do that. But my question is how do I know whether its the low pressure pump just not filling up the VST fast enough for the high pressure to do its thing.

 

[Black Cat]

Clean the oil tank and flush the fuel system. 250 etec with same exact problem.

 

[onehottip]

Make sure the fuel lines are n good shape. If their older than 5 years change them out. The old grey lines delaminates inside blocking fuel delivery. Cheap insurance. Running lean will fry pistons.

 

[tuna sniffer]

Check the Throttle Position Sensor. If loose or has a bad connection it will cause surging.

 

[tuna sniffer]

Try giving Ryan a call he use to be the E-tec specialist with Sunset marine. He has done wonders with my 250 and my neibors e-tex also
+1 619-322-9378

Is Ryan no longer with Sunset?

 

[dwaynesda]

If the fuel ball was going flat, the motor was trying to suck fuel faster than it can be delivered. I would check to make sure your fuel filter is not plugged or your fuel line from your tank does not have any obstructions or a kink in it.

 

[The Canvas Man]

Is Ryan no longer with Sunset?

No he has his own business now doing cleaning polishing fuel/tanks but still dose outboard work on the side .

 

[RodRage]

Call David at Advanced Marine in Costa Mesa 949-338-9980, Evinrude guru and straight shooter, Tell him Todd sent ya!

 

[ssrmr2]

if you have an external tank double check the vent. had the same flat bulb on my whaler which ended up being the fuel tank vent