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Soft and Supple
Now that I have your attention, get your minds out of the gutter. I am still having fuel issues so I replaced the primer bulb and line, hence the soft and supple part. I am trying to eliminate as many things as possible. I am running from a portable tank connected directly to the fuel pump. I replaced the spark plugs again. She started up and ran like a champ from the dock, then... bogged down and would not go faster than a troll. I ordered a fuel pump last night thinking that may be the issue at this point, any other thoughts.
1988 Evinrude 120 V4 looper (VRO disabled by Skools, of course) What I have done so far Run concentrated mixture of SeaFoam, 1 can with 4 gal fresh gas. Cleaned out alot of crap but not the issue. Replaced plugs ( Champion L77jc4), .030 gap Replaced fuel line and primer bulb
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1973 Wellcraft V20 w/1988 Evinrude 120hp 1978 ProLine 20ft w/19?? Evinrude 150hp Last edited by Hedge; 06-02-2013 at 08:51 AM. 
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#2
06-02-2013, 08:59 AM
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what kind of primer bulb did you install? Only use one supplied by an engine manufacture (I use Bomb stuff). I've thrown a bunch of new sierra/moeller/etc... in the garbage. Yamaha makes the best one($$), the mercury and bomb are identical, with the bomb being a little cheaper in price. Beyond that, check the fuel pump diaphram
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#3
06-02-2013, 09:06 AM
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The bulb / Line I put on was a valmar brand.
I have no issues opening the fuel pump to check the diaphragm, what am I looking for?
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1973 Wellcraft V20 w/1988 Evinrude 120hp 1978 ProLine 20ft w/19?? Evinrude 150hp
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#4
06-02-2013, 09:49 AM
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easiest way to see if your fuel pump is bad is to start squeezing the primer bulb as if you were priming the engine while the boat is underway. By do that your hand will be acting as the fuel pump. In other words, if the boat can runs while you are squeezing the primer bulb then it stops when you stop. It should be the fuel pump.
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#6
06-02-2013, 12:01 PM
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Vent is open on portable tank. Bulb is softer but not collapsed, I know it isn't supposed to stay firm. Here is the pump removed and then opened. I don't see any trash and the rubber looks good to me. Other than what you see, I have no clue where to go from here.
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1973 Wellcraft V20 w/1988 Evinrude 120hp 1978 ProLine 20ft w/19?? Evinrude 150hp
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#7
06-07-2013, 09:06 AM
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Quote:
cterrebonne's description of squeezing the bulb got me 15 miles back up the lake one day when pump failed...
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'74 V-20/ BF 150 '95 V-21/ BF 150 '84 V-20/ 200 2.4 Merc '87 V-20/'18 F150 Yamaha 
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#8
06-07-2013, 09:10 AM
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Quote:
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1973 Wellcraft V20 w/1988 Evinrude 120hp 1978 ProLine 20ft w/19?? Evinrude 150hp
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#9
06-07-2013, 10:12 AM
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Has this engine sat for any length of time? It only takes 2 weeks of sitting with gas in the carbs for fuel to varnish and plug your jets. And just because it idles doesn't mean your carbs aren't plugged and varnished. There are 3 different fuel circuits in your carbs, and 2 of the 3 can be plugged and it will still idle but fall flat on it's face when you hit the throttle.
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2011 SUNDANCE B20CCR SKIFF, 2011 YAMAHA 90HP 4 STROKE, 2011 KARAVAN SINGLE AXLE ALUMINUM TRAILER, LOWRANCE ELITE-7 HDI, MINN KOTA RIPTIDE TROLLING MOTOR 2000CC HYDRA-SPORT 225+HP EVINRUDE SOLD  AND THE PINK JEEP!!!! R.I.P. http://www.wellcraftv20.com/communit...ad.php?t=11664 
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