[Tonner]

About to fit an electric fuel pump to my sons Coily and just wanted to know what you in relation to the fuel return line? Not sure if its reqd with the electric and if so how do you connect it up and to what as the fuel pump is fuel in fuel out?

Appreciate some assistance

[whincup]

someone can correct me if im wrong, but... you'll need a fuel pressure regulator, that will have the return line to return excess fuel whilst maintaining required pressure/flow to the carby

[Gwagensteve]

I don't understand the appeal of an electric fuel pump for a carby car? The factory mechanical pumps work really well, support plenty of power (hence their return line) and last around twenty years.
Electric fuel pumps aren't this reliable, add wiring, electrical components and extra connections under the car, and continue to run with the key on ignition position even if the engine has shut off (an important safety issue that EFI cars don't suffer from)

Wiring a pump so it works though a tachometric relay is very uncommon (I don't know anybody who's done it)

Is there a special circumstance that requires you to use an electric pump? (perhaps your car has an EFI head with no provision for a mechanical pump?) Otherwise I'd avoid using one.

[want33s]

Electric pump in carby car can (& IMHO should) be hooked up via an lpg relay to alternator or oil pressure switch to ensure pump stops when engine does in case of an accident.

As Steve said, mechanical pump is simple, cheap, effective and long lasting.

[Tonner]

I have it wired via the oil pressure switch, just wondering about the return line. Why because I have one and don't want to part with a $100 + for a new mechanical pump, last one lasted 3 months though it was non-genuine. Whats a genuine Suzuki pump worth ?

[Gwagensteve]

Genuine is circa $130.
Non genuine pumps are rubbish. I was told this by someone who sells loads of non genuine parts but won't sell non genuine fuel pumps from experience.

I don't know what fuel pressure your pump delivers. If it's over spec (don't have the spec to hand) you'll need a regulator and plumb the return in.

If it's within spec on supply pressure you should be able to plug the return and call it good.

[Tonner]

Thanks for the input, Im in two minds now what to do keep the electric or bite the bullet and get the genuine mechanical pump.

Hmm time for a bit of thought I guess.

[entaran]

If you go electric you'll need an aftermarket adjustable regulator or your carby will look like a fountain. EFI pumps are never lower than about 40psi fuel line pressure and carbies run at like 12-15 psi most of the time.

By the time you buy the aftermarket reg and all the lines you're better off just getting a genuine mechanical one.

I've not really played with Suzuki's much but I have a long history with crazy jap imports

You can always keep the electric and make a lift pump/surge tank setup out of it later!

[tonyevans]

My Purple 1.3lt Sierra runs a normal electric pump with a Weber carby and I have never had a problem with it at all

[SierraDan]

There are low pressure pumps out there.

I still don't agree with them though.

[MrRocky]

If u fit a genuine pump your pretty much guarenteed 100,000km+ of life out of it. If you go the elec carb lift pump i reckon 30,000 would be a stretch