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SuperDave
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« on: August 04, 2008, 12:41:00 AM » |
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Ive been having trouble lately when trying to idle at slow speeds under 5 mph.I have to choke or quickly put it in warm up gear or the motor wants to stall out on me.  It runs like a top when going full out all the way down to 5 mph.The last time I had this issue,it ended up being the diaphragm to the fuel pump was slightly cracked,hard as a brick and no longer flexible.It was replaced a year or so ago,is there any way it could need to be replaced again so soon? |
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WVBowhunter
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« Reply #1 on: August 04, 2008, 01:50:34 AM » |
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yea could be,,but generally they last 3 to 5 years unless they have been setting a lot and dried out. I'd check plugs too.
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"Aye, and lighting bolts fly from my arse"
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Stonewall
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« Reply #2 on: August 04, 2008, 05:49:40 AM » |
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Is it a inline filter or fixed one in the fuel pump Dave? Inline i wouldn't run no more than a year. Like Jim said check the plugs then wires and if that doesn't fix it them hopefully it is timing  |
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Fish to live....Live to fish
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Tiregator
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My big cat19lbs
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« Reply #3 on: August 04, 2008, 04:57:53 PM » |
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The chemicals in the gas nowdays eats hoses ,diaphrams , and pumpballs lately. I have replaced the fuel line and ball each year for the last 3 or 4 because they become hard and brittle. The resisidue can also clog up the carb or injecters, Check the carb float bowl. mine acted like yours last year and I repuilt the carb and replaced the float. The new gas effected the finish of the cork float and perforated the plastic float.
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I fish as much as I can afford to.
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Doctor
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« Reply #4 on: August 10, 2008, 12:48:43 PM » |
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SuperDave,
Just wanted to say thank you for this thread, for 7 years I have been fighting my hard starting Mercury engine when I saw your post I was getting ready to rebuild all the carbs, my engine has been hard to start but lately it would die while idling, so I went to NAPA ordered a fuel pump rebuild kit, took one day to get it Saturday I rebuilt the fuel pump to find out that somebody didn't put all the parts in my fuel pump, there was one of the check valves missing on my pump, the plastic retainer was there but the check was MIA, so I put all new parts in the fuel pump and took it to the lake for a test.
For seven Years I have fought a 10-20 second start up time on this engine, both Saturday and Sunday it lit in under 2-3 seconds and stayed running with out choking or using the fast throttle.
Thanks again buddy you saved my a lot of time and money..................Doc
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SuperDave
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« Reply #5 on: August 11, 2008, 12:14:03 AM » |
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Thats awesome Doc!  with all the help youve given me its nice to know I helped ya at least once! Was the re-build easy enough to do? any special tools? The boat sat for 3 weeks and I thought it was something I would have to take to the marine mechanic to get straightened out.Unfortunately,they have gone out of business,so I decided to take a look for myself   I found a loose connection on the starter and I had to disassemble the whole thing just to be able to tighten it down.  I changed the plugs(they still worked but was really dirty),new battery cables,new Gas tank and fittings,and charged the batteries up to full.It fired right up in warm up but still wants to stall in reverse or when idling in a no wake zone witch is where I fish most. It runs great at faster speeds,so thats what makes me think it might be the diaphragm....it acts like it isnt getting enough fuel. Stonewall, I have an inline fuel filter but its only a few months old. Lenny, I just had the carbs re-built,and it runs and sounds so good full out,I dont think the carbs are the issue,at least I hope not!  |
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Stonewall
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« Reply #6 on: August 11, 2008, 03:49:13 AM » |
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The fuel pump rebuild is simple... You could drop it off by the zoo and have a monkey do it while you eat lunch |
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Doug158
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« Reply #7 on: August 11, 2008, 05:14:08 AM » |
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SD I had the same problem and it ended up being the timing plate what drove me nuts is that sometimes it was fine then the next time it would barely idle  |
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Doctor
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« Reply #8 on: August 11, 2008, 05:39:31 AM » |
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Very easy rebuild, just getting to mine was tough having big hands and sausage link fingers it was tough to get in there to get the thing and getting the new wire ties back on was a treat but I managed it two bolts hold the unit in place against the head I used a multi bit screwdriver pulled the bit out of the larger side and it fits perfect, disconnect three gas hoses and the unit comes out, gaskets have V in them for alignment purposes, couple of springs and the checkvalves and gaskets and your ready to go, I think I'll rebuild mine each year when I change the plugs out..................Doc
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WVBowhunter
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« Reply #9 on: August 11, 2008, 06:18:42 AM » |
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ok why do I see wiggle room with this statement and superdave as a part of the subject matter -- no Dave you don't hear an organ grinder  The fuel pump rebuild is simple... You could drop it off by the zoo and have a monkey do it while you eat lunch |
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"Aye, and lighting bolts fly from my arse"
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SuperDave
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« Reply #10 on: August 11, 2008, 02:13:50 PM » |
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Heck yeah,if a monkey can do it then why shouldnt I give it a shot?! Maybe I could get Flatcatnightmare to play the organ while Im rebuilding it!  I should have fun trying to get parts now that the place I used to get them is now closed.As far as I knew that was the only place that could get parts and wasnt scared to work on a 73 Chrysler outboard.Wonder if NAPA has them? |
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gone_cat_fishing
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« Reply #11 on: August 11, 2008, 08:05:07 PM » |
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I need to do something with mine. Maybe NAPA has the kit for mine.
Stonewall, you don't have a carb and choke assy for a 74 Merc 650 laying around anywhere ,do you?
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Bob  |
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Stonewall
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« Reply #12 on: August 11, 2008, 09:52:52 PM » |
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shakin my head at the '73 chrysler outboard..... mines a '72 they are some of the easiest to work on Dave. When you get a chance take a pic of the choke butterfly showing how the spring hold the two pieces together to make it close correctly, I have had a paperclip holding mine together for 8 years now Bob I have one but I can't part with it the motor is still good but, I will look at the blown '79 45hp and see if they are the same I doubt they are but I will check and see then get back to you. |
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gone_cat_fishing
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« Reply #13 on: August 15, 2008, 09:28:04 PM » |
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Chris, Thank you very much. That would be a BIG help!
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Bob |
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