coversion to electric fuel pump on 1992 7.4 l

[clements RI]

I am tryining to replace the mech FP mounted on top of my water pump with an electric fuel pump. I understand the need for wiring to a pressure switch and a relay and think i have all the wiring info i need, but am not sure of a few things;
1. what would be a good recomended el FP, wht is min.\/max psi, min/max gpm
2. to wire to a oil pressure gage. (I S, P terminals) is there an exiting switch i can slave to or do i need to insall one. and can thisbe done on the water without draining oil?
Have some other quest but will wait to see if i get a relay - will welcome any input or points to similar threads- thanks

 

[alldodge]

Hey @Rick Stephens show him your setup

 

[Rick Stephens]

Hey @Rick Stephens show him your setup

Well, I have a pic of my motor, and I have achris's fancied up wiring diagram. I put those here.

Note, I use a 2 pole oil pressure switch since all it has to do is energize a relay.

5-6 pounds is all you need in fuel pressure. I used the Airtex E1103 fuel pump because I could plumb and mount it using factory Merc OEM parts, including a stainless fuel line to fit my carb.

Happy to assist if there is something useful on my end.

 

[Bondo]

2. to wire to a oil pressure gage. (I S, P terminals) is there an exiting switch i can slave to or do i need to insall one. and can thisbe done on the water without draining oil?
Have some other quest but will wait to see if i get a relay - will welcome any input or points to similar threads- thanks

Ayuh,.... Welcome Aboard,..... Doesn't the dash already have an oil pressure gauge,..??

If yer tryin' to mount one at/ on the motor, go mechanical, tee it into where yer puttin' the oil pressure switch,....

No need to drain the oil either way,....

 

[clements RI]

Thanks Rick. So, everything in the diagram except the relay and pump should already be on the boat? Including the slave solenoid?
I'm having trouble finding a E1103 pump amazon says its discontinued and haven't found it anywhere else yet. ill keep looking but are there any other suggestions. thanks again -

 

[alldodge]

The E1103 may have been superseded just search for "airtex marine fuel pump"

 

[clements RI]

thanks skip, alldog.
I've orderd an airtex E8337 universal marine FP. 5-9 psi, 30gpm

 

[alldodge]

The 5-9 is a good pump but a bit higher then needed for the carb. Carbs like no more then 7 and work fine at 4 or 5. Might need a regulator
But wait till its installed it might be fine

 

[clements RI]

how will i know if it needs a regulator and where would i find the right one.
However i may need to reorder anyway. the one i orderd never came. given that, would i be better with the e8251 2.5 to 4.5 psi vs the 5-9 for the E8337.
id like several opinions if possible - thanks

 

[alldodge]

Might go with Carter P4594, its 6-8 psi and states no Reg required
Many places list it as Auto but others show its Marine rated