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10-04-2019, 11:29 AM #1
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use of primer bulb on efi motor?i
is it common to use the primer bulb when cold starting an efi motor? i leave my key on for 5-6 seconds, assuming elect pump has pressurized lines then crank it. it does not start immediately. do you guys use the primer when u launch? i thought that was a carb thing. jsre said i need to prime first. motor should start immediatly. any comments 225 2.5.?? my yellow/red wire is connected to the solenoid lug
Last edited by KIRCHNER; 10-04-2019 at 11:41 AM.
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10-04-2019, 11:46 AM #2
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my 300x i need to use the primer bulb if i have not ran the boat in a week or so. It fills the low pressure pump that then fills the EFI high pressure pump.
Just a little Cat.
24 Twister V8 E-Rude (For Sale)
2008 Concept Sport Deck 2x 300X
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10-04-2019, 12:14 PM #3
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Promax with vst use primer bulb
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10-04-2019, 12:40 PM #4
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Yep, 1st start of the day pump er up. Should be good rest of day. If not, check for air leaks in line. My stream with a very short fuel run stays tight for months. My other boats with a longer fuel line run need it every time 1st start. Due to expansion and contraction from temps?
83 V-King, 96 Mariner, 200 hp ff block 2.5 w/a 28p choppa
We gotta clean this liberal mess up, VOTE TRUMP TO MAGA!
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10-04-2019, 01:10 PM #5
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I use it to re-prime the line after I change the on board fuel filter on my Yamaha.
1993 Cougar 21ft MTR Superbender SHO
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10-04-2019, 01:59 PM #6
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If JSRE says do it - just do it . All i know he is all that when it comes to knowledge on these merc 2.5 .
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10-04-2019, 02:24 PM #7
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Prime it first start, if the VST is not full you will cook the fuel pump.
Dave1980 Cougar 19 tunnel,90 2.4L Bridgeport EFI in middle of restoration.
1988 BAJA Sunsport 186, 96 225 Pro Max
79 12' Auminum, 95 Merc 9.9
RIP Stu
"So many idiots, so few bullets"
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10-04-2019, 02:39 PM #8
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ILL try priming for cold starts, from now on. see if it kicks right off! thanks guys.. 4 stroke suzuki never need a prime btw.
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10-05-2019, 03:10 PM #9
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Could a primer bulb be put inside the boat off the fuel tank which is easy to get to?
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10-05-2019, 07:12 PM #10
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Thats where mine is, with ports in vertical position discharge up. Clay
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10-05-2019, 07:36 PM #11
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Yep. The fuel cools/lubes the electric pump!
Originally Posted by Dave Strong
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10-05-2019, 07:45 PM #12
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Ya Paul they don't do well if run dry. Originally Posted by Forkin' Crazy
Dave1980 Cougar 19 tunnel,90 2.4L Bridgeport EFI in middle of restoration.
1988 BAJA Sunsport 186, 96 225 Pro Max
79 12' Auminum, 95 Merc 9.9
"So many idiots, so few bullets"
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10-05-2019, 08:05 PM #13
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Ran my 300XS for 10 years with a holley set to 4psi max just to supply engine.
Checkmate 2002 Convincor 270 496 MAG-HO
2003 Cougar 22MTR w/300xs SOLD
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Forkin' Crazy liked this post
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10-06-2019, 05:31 AM #14
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Yes! Originally Posted by seansbaja1982
That is the correct way for check valve to work properly. Originally Posted by Tritontr19
Checking or priming a first start, day/week/month can not hurt and can only help pump.
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