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Fuel Pump Direct Power Feed

OMY31T

By OMY31T,
in Engines & Forced Induction

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scotty nm35 Grand Master

scotty nm35

Posted
Posted

Did this mod, takes a long long time to do it right. I ran 50 amp wiring and a 70 amp relay (incase i go e85 twin pumps) to my 400L walbro, all works. (it doesnt work if its hooked up backwards :unsure: and the pump sounds funny.) but hooked up correct polarity and presto.

Question, which fuse? im running a 25A atm, is this right??

And will I need a fuel cooler?

That sounds like the wiring setup I installed, slightly overkill but at least you never need to do it again. The fuse is to protect the cable, and the pump may draw close to that on startup seeing as it draws up to 18 amps in operation. I would go for a 30 A fuse at least, actually I went with 2 x 30A fuses for my twin 342 pumps.

I need a cooler for the flow the twins are putting out, (similar flow to the 400L) but it takes over an hour of driving to heat the fuel, are you doing long distance driving with your car?

Hanaldo Grand Master

Hanaldo

Posted
Posted

Did this mod, takes a long long time to do it right. I ran 50 amp wiring and a 70 amp relay (incase i go e85 twin pumps) to my 400L walbro, all works. (it doesnt work if its hooked up backwards :unsure: and the pump sounds funny.) but hooked up correct polarity and presto.

Question, which fuse? im running a 25A atm, is this right??

And will I need a fuel cooler?

Haha I did the exact same thing with the polarities! :P

That sounds like the wiring setup I installed, slightly overkill but at least you never need to do it again. The fuse is to protect the cable, and the pump may draw close to that on startup seeing as it draws up to 18 amps in operation. I would go for a 30 A fuse at least, actually I went with 2 x 30A fuses for my twin 342 pumps.

I need a cooler for the flow the twins are putting out, (similar flow to the 400L) but it takes over an hour of driving to heat the fuel, are you doing long distance driving with your car?

+1 for 30A.

abr33 Proficient

abr33

Posted
Posted

That sounds like the wiring setup I installed, slightly overkill but at least you never need to do it again. The fuse is to protect the cable, and the pump may draw close to that on startup seeing as it draws up to 18 amps in operation. I would go for a 30 A fuse at least, actually I went with 2 x 30A fuses for my twin 342 pumps.

I need a cooler for the flow the twins are putting out, (similar flow to the 400L) but it takes over an hour of driving to heat the fuel, are you doing long distance driving with your car?

I live 2 hours from any city lol so mostly 100+ km/h driving on highways.. Whats the giveaway that fuels getting too hot?

scotty nm35 Grand Master

scotty nm35

Posted
Posted

Mine heats up much worse in city driving as there is no under car cooling, on the open road it takes a lot longer. I still have to find a nice 6an trans cooler for the return and then find space to put it, I also need to fit the ethanol content sensor in the return line somewhere. Always so much to do and no time to do it.

Just feel the tank, mine felt hot to touch last time I was at Calder.

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