Notice: We request that you don't just set up a new account at this time if you are a previous user.
If you used to be one of our moderators, please feel free to reach out to Chris via the facebook Outerlimits4x4 group and he will get you set back up with access should he need you.
Recovery:If you cannot access your old email address and don't remember your password, please click here to log a change of email address so you can do a password reset.

Wiring up an electric fuel pump

For all things Electrical.

Moderator: -Scott-

Post Reply
Posts: 178
Joined: Sat Jan 14, 2006 3:14 pm

Wiring up an electric fuel pump

Post by beaver700 »

Gday,

Just wondering whats involved to wire up an electric fuel pump (maybe two). Where should I wire them to in my sierra . Note that there is no simple harness to join up to, because an EFi engine is replacing a carbies one. Any suggestions. Ive heard about the ignition, how should I go about that?

Thanks :)
Posts: 14209
Joined: Sun Jan 11, 2004 11:36 am
Location: Adelaide

Post by -Scott- »

In it's simplest form, you want the electric fuel pump to have power whenever your ignition is on. The coil may be a convenient spot from which to switch your pump. Be aware of ballast resistors and current draw - a relay is probably a good idea.

Ideally, you should include some trickery to ensure the pump only runs when the engine is running. In the event of an accident, the engine could stall with the ignition on - you don't really want fuel being pumped out of a ruptured fuel line. Of course, you need to ensure you have fuel pressure to start with, which could complicate matters. I presume there's commercial "safety relays" to deal with this, but I don't know. I once designed a circuit for this, but never built it - I rolled the car before I "got around to it."

Good luck,

Scott
Posts: 326
Joined: Mon Aug 23, 2004 10:50 am
Location: Oran Park, NSW

Post by festy »

NJ SWB wrote:I presume there's commercial "safety relays" to deal with this
Called a tachometric relay. Available from most aftermarket EFI mobs like Haltech etc. They're a CAMS requirement for EFI cars (or at least cars must have that functionallity, whether internal to the ECU or via a tachometric relay), so should be easy enough to track down.
Posts: 4760
Joined: Mon Dec 30, 2002 6:04 am
Location: Adelaide

Post by murcod »

I believe gas systems use a similar relay? It would probably be a cheaper option than buying aftermarket EFI relays.

BTW make sure you install one- otherwise if the worse happens you could have fuel pouring out everywhere in an accident.
David
Post Reply

Who is online

Users browsing this forum: No registered users and 3 guests