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External / Internal fuel pump differences?

YO880

By YO880,
in Engines & Forced Induction

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Sydneykid Grand Master

Sydneykid

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Posted
Hi Guys,

what are the differences between an Internal and External fuel pump?

i have a GTR pump that i want to use as an external fuel pump (running off a surge tank), any ideas if this is easily done?

thanks

Kent

No problems Kent, for about a year we had 1 X GTST pump in the tank supplying a surge tank and 2 X GTR pumps supplying the engine. Just needed a relay, good earth and + supply from the battery, the standard wiring wouldn't handle the current. :Party:

Sydneykid Grand Master

Sydneykid

Posted
Posted
On the topic of External Fuel pump's.

 

I have got a Bosch 909 fuel pump. I am curious about how to set it up externaly on a R33 gts-t.

Can it be done without a surge tank set up like the VL?

Yep, you just break into the fuel line from the standard pump to the engine and put the the 909 in series. The larger pump will remove the pressure from in front of the standard pump, consequently with no resistance, it will flow much higher. So the the flow rate to the engine is determined by the last pump in the series. You will need a relay of course.

Hope that helps :P

YO880 Mentor

YO880

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Posted

relay is a type of electrical switch, that allows you to use a low current (such as an overloaded wire) to switch on another circuit (ie. high current fuel pump).

i assume you would run the relay off the existing fuel pump power wire (in parrallel)

check out any automotive or electrical shop, the relay circuit picture will be drawn on the relay, use that to figure out which goes where.. if you can't figure it out, probably best to see an auto-electrician.

hope that helps.

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