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keeling time
#1 Posted : Thursday, July 07, 2011 11:34:18 AM(UTC)
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Other than the vent tube, what is the difference between a mechanical marine grade fuel pump and an automotive mechanicl fuel pump?

Are the pressures the same?

Thanks
Keeling Time
1981 32' Marinette Sedan FB
Fresh Water
Twin 318's
Pertronix distributors
Edelbrock 1409's
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tundrarules
#2 Posted : Thursday, July 07, 2011 6:51:29 PM(UTC)
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Quote:
Are the pressures the same?


Good question Keeling Applause pressure may have something to do with our max rpm problems...got to hook up pressure gauge to mine and ck to make sure pressure is around 5.5 psi.




BigM
1985 Marinette 29 Sedan bridge
Twin 318s, 660 hours
New Edelbrock 1409 carbs (working like a charm)
Original Electronic Ignition, Blaster 2 coils, 90 deg plug wire universal kit cut to fit
Raw water system
Freshwater always
Located Pickwick Lake, TN,MS,AL

RETRO BOATS ARE COOL

If the guys on this forum take their time to help you, have the courtesy to update your thread with the resolution.
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pfhlaw
#3 Posted : Friday, July 08, 2011 8:16:20 AM(UTC)
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Many automotive pumps have a weep hole to allow a failed diaphragm to leak fuel out onto the road instead of back down into the oil pan where it would dilute the oil and potentially ruin the engine.
Peter
1981 32' sedan bridge
twin Chrysler 360 cu. in. 250 hp engines
Raw water cooled
Nimbus II
Home port: New Buffalo, MI
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keeling time on 7/20/2011(UTC)
keeling time
#4 Posted : Friday, July 08, 2011 6:22:37 PM(UTC)
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I ordered new marine grade fuel pumps today. The fuel pumps currently on it are automotive type.
Keeling Time
1981 32' Marinette Sedan FB
Fresh Water
Twin 318's
Pertronix distributors
Edelbrock 1409's
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fastjeff
#5 Posted : Saturday, July 09, 2011 5:37:16 AM(UTC)
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The only difference is that third connection. Being a Cheapskate (first class) I drill out the dimple in an automotive pump (yes, it's there) and press in the tube that came with the marine pump. Works just fine and is safe (or I wouldn't do it).

Jeff
"...reality is not nearly as lovely as the world of Liberal Land. No wonder so many people want to go there." - Tom Sowell
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keeling time on 7/20/2011(UTC)
keeling time
#6 Posted : Tuesday, July 19, 2011 5:45:11 AM(UTC)
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Got my new marine grade fuel pumps last night! Quick question - how do you know which is the inlet and outlet fittings? or does it matter? The fuel pumps are not marked "inlet" or "outlet".....

As always - thanks in advance.
keeling time attached the following image(s):
keeling time attached the following image(s): pump.jpg
Keeling Time
1981 32' Marinette Sedan FB
Fresh Water
Twin 318's
Pertronix distributors
Edelbrock 1409's
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Docsnow
#7 Posted : Tuesday, July 19, 2011 6:07:11 AM(UTC)
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Well when bolted on to eng. it should B the inlet pointed to the rear of the vessel. Or there may just B small arrows Think On the fuel pump

Norm,

Big BigMs Live On Dancing
http://www.picturetrail.com/gid23690601 Try it now there's music to listen to while U view the Big M's

http://www.PictureTrail..../index.php?clubID=20726 this one for the Pix club


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keeling time on 7/20/2011(UTC)
Jack Marchand
#8 Posted : Tuesday, July 19, 2011 7:21:57 PM(UTC)
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After just installing two of these myself, here is my 2 cents worth: Get new bolts of the allen head type to replace the originals, some idiot engineer decided the best place for those neat little tubes was right in front of the heads of the bolts....Allens can just sneak by.... also, you will need a bilge monkey for the starboard one, I'm 6'4" and 300lbs...just can't get in there to replace that one. Had a bud do that one, he was 6'3" and 165 soaking wet.....that helped immensley. Good luck. Jack
75 FB express, "Big Enough II" twin 318s, 950hrs, raw water cooling, 1 to 1 transmisions, Beautiful Lake Charlevoix, MI
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keeling time on 7/20/2011(UTC)
keeling time
#9 Posted : Wednesday, July 20, 2011 9:53:18 AM(UTC)
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Thanks to all that replied - I still don't know which is the inlet and outlet - neither are marked with words, arrows, or anything.
Please see my picture posted above.
thanks!
Keeling Time
1981 32' Marinette Sedan FB
Fresh Water
Twin 318's
Pertronix distributors
Edelbrock 1409's
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tr_guy79
#10 Posted : Wednesday, July 20, 2011 10:46:26 AM(UTC)
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It is the port towards the bottom of the picture
"McKenna Renee"
1972 '32 FB Express. Twin 318 / Edelbrock 1409s
Chesapeake City Md (Upper Bay / C&D Canal)
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keeling time on 7/23/2011(UTC)
Jack Marchand
#11 Posted : Wednesday, July 20, 2011 3:42:34 PM(UTC)
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Tr guy is right. The outlet is the one that takes the compession fittings(high pressure copper line to carb), not the hose line from the tank (low pressure) fittings. remember to only use USCG approved rubber fuel lines between tank and fuel pump or you will not pass a survey when going to sell your boat, they are pretty expensive, but legal. Jack
75 FB express, "Big Enough II" twin 318s, 950hrs, raw water cooling, 1 to 1 transmisions, Beautiful Lake Charlevoix, MI
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keeling time on 7/23/2011(UTC)
75 Express
#12 Posted : Wednesday, July 20, 2011 10:08:56 PM(UTC)
75 Express

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Keeling time, where did you purchase the pumps? Did they come with the vent tube for the flame arrestor?
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keeling time
#13 Posted : Thursday, July 21, 2011 5:48:21 AM(UTC)
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75 - I will have to double check as to who I purchased from. There is a metal vent tube that sticks out about two inches or so from the fuel pump. They did not come with flexible tubing that runs from the fuel pump to the carb, I will have to get that. Looks like just simple tygon tubing that is resistent to gas. I have the Edelbrock 1409 carbs and they have the male fitting for the vent tube. I will follow up with prices and vendor later tonight. Hope this helps some.
Keeling Time
1981 32' Marinette Sedan FB
Fresh Water
Twin 318's
Pertronix distributors
Edelbrock 1409's
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BCassedy
#14 Posted : Thursday, July 21, 2011 11:03:45 AM(UTC)
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I just put a fuel pump on the starboard engine (318 Cu In Chrysler). Got it at NAPA (does have the pressed in vent tube). They did tell me that there were only 2 in the country! (Probably / hopefully! just in their system).

(FYI - I may need that 2nd pump. We took Sunset Seeker out last night after replacing the pump and ran her at WOT for a few minutes. Hit 4400RPM / no over heating / some steam from the Port exhaust(?!?!?), motors sounded great. Got back to the marina entrance and Port engine dies - wouldn't restart. Throttle back wasn't done abruptly so I don't believe water went back into the engine (starboard wasn't affected). Didn't have time to troubleshoot, but I'm going to check for gas at the carb 1st thing.

One of us has "always need somethin' for da boat..." as a moniker... Ain't it da "troof".. d'oh!

Bill
Bill & Sharon Cassedy
" Sunset Seeker "
1988 32' Fly Bridge
Twin 318 Cu In / 240HP Chrysler power plants
Raw water cooling
Freshwater boat
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keeling time
#15 Posted : Thursday, July 21, 2011 3:09:40 PM(UTC)
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75 Express - I ordered two of the Sierra 18-7524 fuel pumps from go2marine.com
Go2marine's part number for my application is 85333 and cost about $80 each.
Double check for correct part number and year for your particular application.
Hope this helps.

Keeling Time
1981 32' Marinette Sedan FB
Fresh Water
Twin 318's
Pertronix distributors
Edelbrock 1409's
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Jack Marchand
#16 Posted : Thursday, July 21, 2011 3:19:30 PM(UTC)
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I took the best price I could find on the web, I believe it was abou $45 each, and took that to my favorite auto parts place and they matched the price.... had my pumps the next day too. Jack
75 FB express, "Big Enough II" twin 318s, 950hrs, raw water cooling, 1 to 1 transmisions, Beautiful Lake Charlevoix, MI
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keeling time
#17 Posted : Saturday, July 23, 2011 6:50:13 PM(UTC)
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Two brand new marine grade fuel pumps - $160

Installation - my sweat equity

Knowing it was done right and with the correct parts - PRICELESS

Jack - I was able to use the standard bolts with a 9/16 socket and long extension for one bolt and a 9/16 ratcheting wrench for the bolt that was hard to reach. Tightened that bolt by contortioning by body and arms, bringing the wrench from the bottom of the fuel pump and up to the bolt. The wratcheting wrench did the trick.
Keeling Time
1981 32' Marinette Sedan FB
Fresh Water
Twin 318's
Pertronix distributors
Edelbrock 1409's
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75 Express
#18 Posted : Saturday, July 23, 2011 11:38:37 PM(UTC)
75 Express

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Thanks Keeling time. It's good to know we can still get themDancing
Stan
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dougrose
#19 Posted : Sunday, July 24, 2011 2:39:07 PM(UTC)
dougrose

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The diaphragm pumps are "flow-thru", meaning that if you blow into the fuel inlet (tank side), air should come out on the outlet (carburetor side). If you blow the other way, you are against the valves and nothing happens. Please, no jokes.


1975 32' Flybridge Sedan, twin Perkins 6-354 diesels, 1:1.53 velvetdrives, 16 X 19 props. Merritt Island, Florida
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