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Fuel Issue VRO or primer bulb etc 100XP V4

E

edmaude

New member
"I was running for about an ho

"I was running for about an hour today no issues. Go get lunch get back on boat and engine starves itself from fuel and VRO Alarm goes off. VRO alarm will stop when I pump oil tank bulb ande fuel tank bulb to keep engine running.

Had a mechanic look at it and he tightened all fittings etc and still same condition. The primer bulb is less than a year old and seemed to function fine in his opinion. He suggested that perhaps some seals inside the VRO pump are bad and air is getting sucked in, which makes sense. The pump was installed in past 2 years by prior owner, can it be bad that quickly

I was planning on pre-mixing anyway, should I purchase a fuel only pump from an 88SPL engine?

Ed"
 
"Is it a steady alarm or an on

"Is it a steady alarm or an on/off/on/off at one second intervals?

If on/off/on, along with no fuel delivery, I would check the pulse hose and limiter. It's also possible the air motor is shot, but that would tend to happen gradually. My guess is the pulse hose or limiter is clogged, fell off or something like that. Those symptoms point to the pump not cycling at all. If the pump was sucking air, the engine would smoke excessivly if the leak was on the fuel side. If on the oil side, you'd get a no oil alarm during prolonged idling.

If the alarm is steady, there is a fuel restriction that would starve the engine of fuel, but also indicate the VRO pump is operating normally."
 
"Alarm is off and on every sec

"Alarm is off and on every second or two, which I believe is lack of oil.

Since I want to ditch the VRO, should I try and cap off system etc and run premix with current VRO pump?

I still seem to not be getting enough fuel either, could oil side of pump screw with fuel side pressure"
 
"I doubt capping the oil and r

"I doubt capping the oil and running premix will solve your problem. From what I can gather from your post, no part of the pump is functioning. Either the pulse hose or limiter is clogged or disconnected, or the air motor in the VRO pump has suddenly failed. Checking the hose is easy. It's the hose that comes off the bottom at the big end of the pump. It should go to a fitting on the crankcase that has a large blue insert on the side facing the pump. Make sure the hose is intact. Pull the hose off the bottom of the pump and make sure you can feel pulses. If the pulses are strong, replace the pump. If not, inspect the hose for leaks and take the fitting off the crankcase and check to see if it's clogged up or anything."
 
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