Where's my fuel pump?

[Superflid]

I picked up a (very cheap) Johnson from about 1960, pretty sure it's a 7.5 hp.<br /><br />Cleaned out carb, cleaned and set points, primed with bulb on fuel tank line and pulled starter.<br /><br />Fires almost every time, sometimes runs for a few seconds but then needs fuel pumping again before it'll fire.<br /><br />The fuel line from the tank goes to a connector on the baseplate, from there to the carb. Obviously this needs to have fuel running uphill to work! <br /><br />Is there supposed to be a fuel pump somewhere on the engine that has gone astray on mine? Or do I just hold the tank over my head all the time....<br /><br />Here's a pic of it if it's any help.<br /><br />

 

[JB]

Re: Where's my fuel pump?

Is there a model number on the transom clamp or on a freeze-plug looking disc on the block, Superflid?<br /><br />Your engine may need a pressurized tank with twin hoses.<br /><br />The model number will tell the tale. Then we can help you get her running.

 

[Superflid]

Re: Where's my fuel pump?

Thanks JB.<br /><br />Plate missing from transom clamp, number on round disc on block is 1420357 (maybe J420357) along with "Seahorse" logo. Can only find part numbers on rest of it, nothing more helpful, sorry.<br /><br />Pressurised tank makes sense though, there is a short length of pipe (same type as fuel pipe) coming from the block near the inlet manifold, going nowhere. I suppose this could be the pressure feed to the tank.<br /><br />Will I need a different type of tank if it is the pressure type?

 

[rickdb1boat]

Re: Where's my fuel pump?

You will need a pressurized tank with twin hoses or convert it to a fuel pump style and use a regular single hose tank. You will need to find a place on the engine to draw vacuum pulses for the pump. Pressurized tanks are sometimes found on E-Bay..<br /><br />Like this one:<br /><br /> web page

 

[Superflid]

Re: Where's my fuel pump?

Just spent half an hour looking through Ebay, didn't find that one!<br /><br />Found plenty of parts for the Johnson, and also for the '73 Evinrude 4 hp i've got, over there. Biggest problem is that most sellers only ship to USA. Will keep looking, but adding a pump seems to be the best option.

 

[phatmanmike]

Re: Where's my fuel pump?

superflid, almost any seller will ship to uk if you ask, dont mind that little type at the bottom... they want money as much as you want the tank, ask and ye shal recieve

 

[Superflid]

Re: Where's my fuel pump?

Thanks mike, will give it a try at least!

 

[Superflid]

Re: Where's my fuel pump?

Would this be the right tank?<br /> Ebay.com<br /><br />They quoted me $40 for shipping, I'm happy enough with that.

 

[rickdb1boat]

Re: Where's my fuel pump?

Yes, it would...

 

[Superflid]

Re: Where's my fuel pump?

Thanks gentlemen. Will keep you posted.

 

[Superflid]

Re: Where's my fuel pump?

Back again!<br /><br />Still working on finding that tank.<br /><br />In the meantime I thought I'd take a look at the impeller. 4 bolts came out nice and easy, gearcase starts to drop for an inch or two but seems to be held on by the gearchange linkage.<br /><br />Am I doing something wrong, or is there a technique to this I've yet to discover? <br /><br />Glad there's somebody out there who knows what they're talking about!

 

[Brew2]

Re: Where's my fuel pump?

Usually there is a pin or bolt that has to be removed to disconnect the lower unit shift rod from the powerhead. I know on my 80's motor it is underneath the carbs. No idea on a 60's motor.<br /><br />Maybe get someone to gently work the shift while you look around the powerhead for the connection point to the shift rod.<br /><br />If nothing else, this will get your post back to the top where someone with more experience can help out!<br /><br />Cheers,<br /><br />Brew

 

[Paul Moir]

Re: Where's my fuel pump?

Superflid, if that is a 7.5hp Johnson, then you must remove the powerhead (engine proper) to access the linkage between the shift handle and the shift rod. It is in the midsection, directly underneath the powerhead. <br />It's not as difficult a thing to do as it seems. Just disconnect the fuel and pressure lines, and unbolt the engine. You'll need a new powerhead gasket to put the engine back on.<br />Be aware that the lower crankshaft seal will probably stay with the driveshaft. It's made of a few peices, so don't loose any. Finally, you'll probably have to rotate the driveshaft a bit to get the lower unit to drop all the way. There's a pin through the driveshaft to support the lower crank seal. It must go through a slot in the mid-section.<br /><br />I hope this helps! <br />I also hope you also have a manual on the way!

 

[Superflid]

Re: Where's my fuel pump?

Thanks Paul (and Brew). Manual is on it's way! <br /><br />I've worked on most types of engines (apart from outboards!) so it should be easy enough now.<br /><br />Ken.

 

[Chinewalker]

Re: Where's my fuel pump?

Hi Superflid,<br /> Here's what you have: It's one of three models, all 7.5hp Johnsons, and all pretty much the same.<br />AD-10 - 1956<br />AD-11 - 1957<br />AD-12 - 1958<br /><br /> All three require the dual line tank, which you've already discovered. <br /><br /> The 7.5s were great running motors and can continue to provide good service with a few precautions. You're already working on one of them - the waterpump impeller. Also, you MUST run at least a 24:1 fuel/oil ratio in that motor. Mid-grade gas is fine, mixed with brand-name outboard oil - don't scrimp to save a few shillings...<br /><br /> To get at your impeller, you have to remove the powerhead from the mid-section. Not as daunting as it may seem. Take care to salvage the gasket between the two surfaces as best you can, as you'll need it to trace out a new one on gasket material. Also, take note of the order in which the various springs, washers, seals at the top of the driveshaft are presented. They act as a lower seal to the powerhead.<br /><br /> I have a '55 Evinrude (VERY similar motor) and use it frequently. Enjoy!<br />- Scott

 

[Superflid]

Re: Where's my fuel pump?

Thanks Chinewalker.<br /><br />Plenty good advice, and from the pic of "The wall" I have a long way to go yet, only got 3 outboards so far.

 

[Superflid]

Re: Where's my fuel pump?

Update.<br /><br />Removed powerhead, 1 broken bolt. No big problem, been there many times before! <br />Had another screw break taking the pump cover off. <br /><br />Powerhead gasket still in one piece, will make up a new one.<br /><br />Will have it all back together soon. <br /><br />Found a pump which will do away with the need for a special (expensive! ) tank. <br /><br />Found that sometime during it's long life someone has painted it white - including the inside of the middle section! White paint flakes are everywhere. <br /><br />Discovered that it's true, I asked. All but 1 US Ebayer I asked is happy to ship to the UK. <br /><br />Thanks for all the help guys, Im sure I'll be back for more!