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Convert to electric fuel pump

M

MRD

New member
I have some 1980 Ch350 Crusaders (454) and was thinking on changing them over to electric fuel pumps. Does anybody have any ideas on which fuel pump to use. They both need replacement and can't come up with any reason not to. The main reason is I can"t seem to get the engines run long enough to prime the lines,They run long enough to drain the filter down enough to starve engine, maybe a minute or two, maybe 3 feet up the line to output of tank and 10 to 15ft to filters. It's quite a long draw from the tanks. the tanks were empty for years. after getting them running I find I'm having trouble priming the lines. It seems like a more efficient way to go.
I have 35 gallons of gas in tanks I would think this would be enough to get them primed and running? 150 gal Port tank, only using one tank at this point and running one engine at a time. Thanks
 
MRD said:
I have some 1980 Ch350 Crusaders (454) and was thinking on changing them over to electric fuel pumps. Does anybody have any ideas on which fuel pump to use. They both need replacement and can't come up with any reason not to. The main reason is I can"t seem to get the engines run long enough to prime the lines,They run long enough to drain the filter down enough to starve engine, maybe a minute or two, maybe 3 feet up the line to output of tank and 10 to 15ft to filters. It's quite a long draw from the tanks. the tanks were empty for years. after getting them running I find I'm having trouble priming the lines. It seems like a more efficient way to go.
I have 35 gallons of gas in tanks I would think this would be enough to get them primed and running? 150 gal Port tank, only using one tank at this point and running one engine at a time. Thanks
Click to expand...

:)Talking to some guys at Marine and they said, best idea is to stick with mechanical fuel pump, and that If I were to install a small electric pump in line with the filters( with 6 psi regulator) and run a button up to the helm and use it for priming, then let the mechanical pump do the rest of the work, because of the length of the fuel lines from tanks these large boats are notorious for loosing prime, Sounds like a great Idea.... :D
 
There is no need to install an electric fuel pump up-stream of the mechanical pump.
Go one way or the other.

With the electric fuel pump, you'll need the circuitry that includes the N/O oil pressure switch.
You'll also need a means of operating the pump during cranking and low oil pressure.
This must meet USCG regs if operating within the U.S.

Do you own a Tempo Oil Boy extractor?
If not, you should. There are multiple uses for this extractor.



If so, use the Oil Boy to pull fuel through your system up to the mechanical pumps.

If your anti-siphon valves are good, and if your fuel lines are good, once primed there should be no "drain-back".


As a tip...... always fire your engine up prior to a fuel fliter cartridge change. This primes the system from the pump to your carburetor.

Using caution, pre-fill the cartridge to about 80% just prior to installing it.


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i have 1983 220 crusaders .purchased two marine electric fuel pumps at JEGS .comes with all the wiring to connect to oil presure sensor . easy install . quicker startup. best decission i made .
 
If you want to save starter motor time and wear, and unnecessary cranking battery loads, we can install a momentary helm switch, in lieu of the start-by-pass circuitry. As long as the helm switch is "momentary", I believe that the system meets the regulations.

Activate the helm switch (to prime your system) without even one crankshaft revolution.

That may not sound like much of a savings for the starter motor or cranking battery, but it does add up over the years.


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Electric pumps are great at pushing fuel, but not so good at pulling fuel. If your having a problem getting fuel to the pump your going to have to prime the system as suggested. An outboard motor priming bulb temporally installed in the fuel line works also.
 
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