rebuild kits for carter fuel pumps?

[biggjimm]

I've got a mercruiser 140 3.0L & I'm trying to find a rebuild kit for the fuel pump. It's '77 or '78 & I believe the mercruiser part # for the pump is 86234A4. The Sierra part # is 18-7278.
And as an after thought, can you safely replace the fuel pump with an inline electric pump on a boat?
Thanks. Jim.

 

[DeepBlue2010]

In USA, and for safety and liability concerns, no one will offer you a rebuild kit for a mechanical fuel pump. Just buy a new one. The answer for you electric fuel pump is yes, but you need to know what you are doing or have a step by step instructions. There some gurus on this forum that can give you that if you decide to go this route

 

[stonyloam]

Actually, if it is old enough (and yours may be) there is a diaphragm kit available. #3 here http://www.mercruiserparts.com/Show...0&bdesc=FUEL+PUMP,+FUEL+FILTER+AND+CARBURETOR the newer fuel pumps are not rebuildable (as far as I know) so make sure you have the correct pump. You can use an electric pump, it must be marine rated, you must use a oil pressure switch and a fuel pump relay, but it is a fairly easy wiring job.

 

[DeepBlue2010]

Try to call or check availability, they will not fulfill the order. I spent some time with this issue before. Hopefully your luck will be different.

 

[biggjimm]

Where can I get the oil pressure switch if I decide to go with an electric pump? Would the switch be closed to complete the circuit when there is oil pressure to provide a ground signal to the relay?

 

[alldodge]

Where can I get the oil pressure switch if I decide to go with an electric pump? Would the switch be closed to complete the circuit when there is oil pressure to provide a ground signal to the relay?

A lot of places have them, even your local auto parts store. Here is one
http://www.summitracing.com/parts/crt-a68301?seid=srese1&gclid=COrc653c_sYCFQMbaQodBHUGgA

The switch would close to complete the circuit, here is a wiring diagram to install

 

[stonyloam]

Because of the higher current load you really should use a electric fuel pump relay to power the pump rather than drawing the power from the ignition switch here is the diagram: https://www.google.com/search?q=mar...wgfE65KvM:&usg=__YNCUGagVR3JbE_ALIgnTInca-ms=

 

[biggjimm]

Thank you alldodge. That is pretty much what I was thinking it would take & yes stonyloam I was planning on putting a relay in to handle the load without running it thru the ignition switch. Haven't decided for sure yet but probably going to just order a new mech. pump as I've located one around $130 & by the time I purchase a marine elect. pump & all the necessary components I'm going to spend more than that anyways. I thought I could change it to electric instead of spending $200+ on the mechanical pump but I think for $130 I'll stick with the mechanical pump for now. Thanks a lot guys, I really appreciate all the insight & comments & help. Jim.