I have been observing low fuel pressure on our stbd side engine at the engine filter and mildly hard starts as well as some idle surging. I am suspecting the fuel pump. Has anyone experinced similar symptoms? Also is the stbd a right hand or left hand rotation pump?
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Thread: 12-71 fuel pump
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08-15-2016 03:43 PM #1
12-71 fuel pump
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Re: 12-71 fuel pump
Any number of fuel system problems can cause the symptoms you are referring to. Don't condemn the pump without checking for restrictions, air leaks or other fuel quality issues. Fuel pump rotation is marked on the pump itself.
--- The poster formerly known as Scrod ---
I want to live in Theory, everything works there.
1970 36C375
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08-16-2016 12:17 PM #4
Re: 12-71 fuel pump
This is good advise. So far I have replaced the racor filter, engine fuel filter and also replaced a leaking reference line that was connected to the mechanical fuel pressure guage which was also bad. I have also tried altering the feed and return lines to the other tank. All signs point to the pump. Any other suggestions?
Last edited by MVCaprice; 08-16-2016 at 03:16 PM. Reason: SP :)
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Re: 12-71 fuel pump
Thanks. I always try to give goo advice.
If you really want to dig the only other things I can think of are installing a section of clear hose near the secondary filter to make sure there's no air. Also isn't there is a pressure regulator on the return from the heads that maintains rail pressure? You may want throw an eyeball on that. OTOH, we may be overthinking it and at this point it probably is the fuel pump.--- The poster formerly known as Scrod ---
I want to live in Theory, everything works there.
1970 36C375
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08-16-2016 05:24 PM #6
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08-17-2016 08:36 AM #7Senior Member
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- Apr 2008
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Re: 12-71 fuel pump
Put a gauge on it!
GLORY Hull # 365
Northport, NY
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08-17-2016 02:44 PM #8
Re: 12-71 fuel pump
Last edited by MVCaprice; 08-17-2016 at 02:46 PM.
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08-17-2016 02:59 PM #9
Re: 12-71 fuel pump
Change the $125 pump and see if it's the problem.
It's taken more time than worth.Scott
41C117 "Hattatude"
Port Canaveral Florida.
Marine Electronics and Electrical Products Distributor.
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Re: 12-71 fuel pump
For what's its worth...both my 1271's idle at 4-5 psi and run in the 40-45 range at 1750 rpm cruise. I have no issues as you describe. In fact, I posted last month about running a tank dry and using my cross connect system to run both engines at cruise off of one pump for two days. My filters are clean; i.e., no known restrictions.
There is a idle screw governor adjustment for rolling rpm, but if it clears up on its own after warming up for a few minutes...