speedometer and fuel gauge out.....help troubleshooting

M

mphsjeep

Seaman Apprentice
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Dec 6, 2009
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31
Great first boat day yesterday(late start to the season, I know). We have a 98 Stingray 19' with a Merc 3.0.

Two issues I need help with on troubleshooting:

1. Speedometer is not working. Never gave a problem before. Cannot see anything blocking the little intake hole. Tips on detailed troubleshooting?

2. Fuel gauge is not working. This has never worked perfectly. The needle would always jump around while in motion but now has went dead. First part of the day the needle stayed around the "E" with minor movement like it was stuck then dropped way below. I have fixed floats on jetskis but this looks more complicated. Are there fuses to check? Ideas?

Thanks in advance...
 
Bt Doctur

Bt Doctur

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Aug 29, 2004
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19,321
Re: speedometer and fuel gauge out.....help troubleshooting

Alpha drives dont have speedo ports? Alpha GEN II do. fuel gauge is tank mounted
 
Bondo

Bondo

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Messages
70,994
Re: speedometer and fuel gauge out.....help troubleshooting

mphsjeep said:
Great first boat day yesterday(late start to the season, I know). We have a 98 Stingray 19' with a Merc 3.0.

Two issues I need help with on troubleshooting:

1. Speedometer is not working. Never gave a problem before. Cannot see anything blocking the little intake hole. Tips on detailed troubleshooting?

2. Fuel gauge is not working. This has never worked perfectly. The needle would always jump around while in motion but now has went dead. First part of the day the needle stayed around the "E" with minor movement like it was stuck then dropped way below. I have fixed floats on jetskis but this looks more complicated. Are there fuses to check? Ideas?

Thanks in advance...
Click to expand...

Ayuh,... The pitot tube runs from the drive, to the speedo,... Inspect it's entire length,...

The gas gauge is Not motor/ drive related, go to the electrical forum for help with it,...
 
M

mphsjeep

Seaman Apprentice
Joined
Dec 6, 2009
Messages
31
Re: speedometer and fuel gauge out.....help troubleshooting

How can I get to the sensor in the prop housing? This may be as simple as some junk stuck in there behind the prop. Does the water flow through there and prop or is it totally isolated in function?
 
M

mphsjeep

Seaman Apprentice
Joined
Dec 6, 2009
Messages
31
Re: speedometer and fuel gauge out.....help troubleshooting

New to this but somewhat mechanical(sea doos), what are the most common problems that occur? Just need somewhere to start.

Confirming...so this is just a tube that water flows through all the way to the gauge? So im basically looking for obstructions? Is it safe to blow out or flush out the tubes/fittings in the drive in either direction?
 
Bondo

Bondo

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Messages
70,994
Re: speedometer and fuel gauge out.....help troubleshooting

mphsjeep said:
New to this but somewhat mechanical(sea doos), what are the most common problems that occur? Just need somewhere to start.

Confirming...so this is just a tube that water flows through all the way to the gauge? So im basically looking for obstructions? Is it safe to blow out or flush out the tubes/fittings in the drive in either direction?
Click to expand...

Ayuh,.... Water pushes against the pitot openin', causin' the air pressure in the tube to move the needle on the gauge,...

Most common problem is crud blockin' the pitot openin',...
Or a disconnected tube at an intersection,...
 
M

mphsjeep

Seaman Apprentice
Joined
Dec 6, 2009
Messages
31
Re: speedometer and fuel gauge out.....help troubleshooting

Think I got it. Disconnected the tube according to the diagram above. Pushed air through the long tube, speedo moved. Hooked a tube to the connector adapter going into the drive and was not able to blow air through at first. Took a long needle punch and poked directly to where the intake is. Push, twist.....free air flow :)
 
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