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70 hp Johnson hard to start.

70 hp Johnson is hard to start the first time but starts good the rest of the day. Seen to flood out on first start.

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Could be the choke isn't closed all the way for the first start. Then when warm the motor doesn't need to be choked.

Posted on Aug 04, 2009

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Why won't my 72 50hp johnson start?


You should let the old fuel out and get some new fuel. If it has a set of points for the spark timing make sure they are clean and don't have a spike. Make sure the air filter is clean. You may have flooded it or maybe the other way, not enough fuel. You can clear the flooding by taking the spark plug out and cranking it to blow out the cylinder.

Jul 09, 2016 | OMC Reverse Gear Genuine 50 Hp 72

1 Answer

Where do you find the fuel pump reset button for Suzuki Liana 2001 (in unstated country)


it's not a ford, (park that ford manual now)
short answer, only in your dreams....

got 12vdc to the pump? cranking?
got spec fuel pressure cranking and running?
that matters
as does not checking spark first
the PCM cuts fuel if spark is dead, (3 ways)
1-cmp dead
2-ckp dead
3-ignitor dead.
3 ways. and all 3 stop crash and burn, as seen on TV.


why not post symptoms, then ask for how to diagnose this problem.
instead of guessing wrong.
why guess?
the tests are easy , ask how.
if you dont have tools its mostly just flaying about.

no start 101:? (pasted in , vast times)
Cranks over fast, but will not start. (posted , 100 times now....)
Mr. Otto Cycle engines,.... (spark/gasoline/petrol)
no start or stalls, and will not start now.
There are over 50 causes. even a simple rusty fuse. (or worst hair line cracked)
Head lights work and not dim? CLuster lights all work like new car?
We use PHYSICS to find cause. Never guessing. (meters , gauges and 1 scan tool)
About 1 to 10 tests.

1: Fuses good?, all EFI and spark fuses?????not just looks GOOD (test them)
2: Check engine lamp glows key on, ? if not? see #1
3: I crank engine, it cranks fast. but do you have spark on all cylinders. (not just 1 , all)
4: Is spark timed right, not 25 degree's retarded, if retarded illegally, that is the cam drive slipped. (belt or chain,no matter)
(5min with a timing light and wow, the bad ignored belt, is discovered)
The cam belt is a 60k miles service, point on most cars. (with belts) so.....
5: if you find spark is dead on any cylinders and is not bad spark parts (wires,cap/rotor/plugs)
I then use a scan tool cranking and see P03xx DTC errors. P340s or P355s cam/crank sensor dead.
or if pre-1996 cars in USA, we use the 2 cent paper clip, diagnostic jumper clip, to find DTC errors.
DTC means "Diagnostic Trouble codes"
6: spark is good on all, now.... note my order here???? not gue$$ing, just testing,,,,,,
so we then use a can of "test fuel" now. 100 years we do this... it's a not new idea or magic.
watch Scotty do this here.
https://www.youtube.com/watch?v=064Ilsz8Fzg&NR=1&feature=fvwp

Does it run on test fuel.?
NO. bad engine. check compression, 150psi min. times all cylinders, not just one.
Engine ok, but spark is bad, will cause test fuel test to fail.
YES? runs for 3 seconds now, then you lost fueling. (congrats getting this far !)
Keep in mind all EFI gas engines, the brain cuts fuel if it sees 3 lost spark issues.
"CMP dead,CKP dead,Ignitor dead" to prevent fires. so not scanning the PCM you will never find the problem.
What to test next is a toss coin deal.
NO DTC errors, i then whip out my trusty fuel pressure gauge, cost all of $20bucks (investment grade it is with pay back !)
check fuel pressure next. it must be in SPEC range, as this is NO CARB car. it's EFI.
EFI means Electroinic fuel injected.
I'll not show all fueling tests , that is 10 pages of text, or read a ASE book on topic.

but... in short....

Fueling:
got 12vdc to the pump cranking?
do you? (any $10 voltmeter made works for this test.... or better)
you need to crank it to prove pump is dead... on half 1/2 the cars made.
we do all, that way, so that we don't get confused or wonder how EFI logic works.
"programming varies by that in the ECU" Some ECU/PCM had reflashes that upgrade this LOGIC.
The Suzuki J18 is a classic example of change. (must crank, just like 1989 cars)
If fuel pressure is low, the injection rates will HOPELESS.
if fuel pressure is crazy high like 60psi, the engine will flood hopelessly.
our engine here runs 30PSI.
we can do injector leakdown rates and balance test. and for sure im not typing that out...
end.

and last.
here is the USA page for Suzuki books
note how Liana is missing.
we dont have it.
https://suzukipitstopplus.com/Category/3-suzuki-service-manuals.aspx

next time post your country so we can give you answers based on how your car is made , not ours.

Jun 13, 2015 | Suzuki Liana Cars & Trucks

1 Answer

What could I damage on my boat fuel line? Primer bulb, any filter ... ?


There could be several reasons. I'd first look at stuck floats in the carbs. I believe there's 3 carbs and if all spark plugs are wet all floats are sticking.

But assuming it didn't overheat, and the spark plugs are wet with fuel (as opposed to water) - sometimes a defective coil will short out only when it gets warm (most time they short all the time). They can be tested.

A very good mechanic once told me there are only four things to concentrate on: Suck, Squish, Bang, and Blow. In other words, Fuel delivery, Compression, ignition system/spark, and proper exhaust. My experience has been that I've never had to worry about Blow (knock on wood) with an outboard. Others have however.

Additional advice: The number 1 cause of outboard problems is gas. Todays fuels are great for fuel injected cars but break down sooner than old gas mixtures. Always put a fuel stabilizer in you tank. It's cheap and only takes a few ounces to protect from hundreds of dollars worth of carb work - and avoid sticky floats.

Jul 06, 2014 | Clymer Evinrude/Johnson 2-70 HP Two-Stroke...

1 Answer

I have a Johnson 70 outboard motor and I'm having


The moter has locked up is it 2sroke or 4sroke if 2 did you have oil in the fuel ?

Apr 29, 2013 | Boating

1 Answer

Boat engine 1995 Johnson Outboard 70 HP


Ihave a 1991 70 hp Johnson outboard thats hard to start the first time but starts good after that. Seems to be flooded. Starting rpm seems to be low.

Jun 25, 2009 | Boating

1 Answer

1991 Johnsoon 90 HP outboard hard to start, floods after stop


Hi, You did a good job of assessing the problem. It sounds like the float valve in the carb is the likely problem. This would overfill the carb when sitting, flooding the engine and the pressure in the bulb pump would go down as the fuel leaked out. Float valve should be investigated and that should Fixya!

Mar 13, 2009 | Boating

3 Answers

96 Astro Fuel Pump Question?? no start/Flooding


With the upper plenum removed and spark disabled turn on the key and allow the fuel pump to prime while watching the fuel lines from the back of the intake to the injector. I suspect you lines are leaking. Have seen this before. ALOT.

Nov 24, 2008 | 1996 Chevrolet Astro

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