Replacement M3 Lift Pump and raw water alarm

[Mike Yates]

Hey guys, I have a curious fluid coming out of the new lift pump I just installed. I purchased it from SBMAR, it functions flawlessly and restored my fuel pressure, but after running there’s a single hanging drip of red liquid with no visible trails. I’m sure you’re thinking its diesel fuel but it has no smell to it, has no lubricity, and evaporates from your gloves when you smear it around your fingers. Any ideas? I’d hate to pull the pump off again to not find anything. I’m wondering if its an assembly lube or the like that needs to settle out?

Also, I just picked up the aqua signal raw water flow switch and bronze fitting kit during the sale. I had planned to install it after the raw water pump, but I’m thinking it be best at the end of the raw water circuit before the exhaust riser. Any pros or cons that you could think of placing it there?

Thanks Mike

Topic

[Mike Yates]

Raw Water Alarm

Its a 1.5″ bushed out to 1.75″ to accept the raw water alarm. The mixer is 1.5″ as well.

[donald roth]

IMO, this is the very best location for the raw water flow alarm sensor.
It will react to not only a pump failure, but also any other problems with the coolers and hoses throughout the system.
I know from experience that a failed hose clamp and dislodged hose downstream from the sensor will not trigger an alarm.
I was fortunate to have a working temperature alarm on the exhaust elbow!

[Rob Schepis]

Looks real good to me. Is the hose barb/nipple on your mixer 1.5″ and you just bushed/sleeved it out to 2″ ?

[Mike Yates]

Raw Water Alarm

Since posting the fluid drip on the lift pump has stopped. So, I don’t have a picture to share. I’ll just keep an eye on it.

I installed the raw water alarm on the end of the circuit. I figured there be less of a chance of large pieces (say impeller blade) fouling the alarm switch. My 6BTA -M3s have the 1.5″ raw water circuit. I was able to use reducers to make it work.
Any issues or hazards you can foresee with this install? Thanks

1 user thanked author for this post.

Tony Athens

[Tony Athens]

How about a really good picture of the RED STUFF?

Water Flow alarm–They work on both the suction side (if 2″) or on the output side of the pump. You need to put it where the hose has the correct ID What the ID or your hose feeding the mixer? 1.5″ ??

[Author]

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