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electric fuelpump

 
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36 roadster
Rookie


Joined: 24 Nov 2020
Posts: 23

Posted: Tue Jan 13, 2021 12:46 pm    Post subject: electric fuelpump

howdy,does anyone know of an electric fuelpump which can supply 400 c.i.
mill and is externally (not in fuel tank)mounted. (something from the wreckers would be nice!)thanx
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Pep
900RPM



Joined: 14 Jun 2021
Posts: 936
Location: Georges Hall, NSW

Posted: Tue Jan 13, 2021 1:45 pm    Post subject:

I am told a VL dunnydore will do nicely when I get my 351 running EFI. They are apparently fairly quiet as well.
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Mr Cool
800RPM



Joined: 27 Sep 2020
Posts: 880
Location: Bacchus Marsh, Vic

Posted: Tue Jan 13, 2021 3:41 pm    Post subject:

I'm also assuming you want an EFI high pressure pump as you did state external from tank.
Bosch make a reasonably good pump but at around $300+ they aint cheap.
Howard Bell used twin mercedes pumps feeding a KB 8 litre engine in his torana, and thats a heavily worked engine, they can be picked up at the wreckers for a reasonable price. I'm pretty sure VN-VS crummydore used external pumps on all V8 engines, they should be ok for everyday driving, but if you need real performance install two pumps, that way you'll also get a backup system as a bonus if one fails. BTW the V6 was an internal pump.
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Posted: Sun Mar 07, 2021 8:45 pm    Post subject:

But Vn on Station's used an external and internal pump
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choco
700RPM



Joined: 11 Jun 2021
Posts: 795
Location: Queanbeyan, NSW (on the ACT border)

Posted: Mon Mar 08, 2021 7:07 am    Post subject:

Are your fuel rails aluminium? What kind of HP? What is the injector flow rate? Normally aspirated? A VN Commodore external FP will be OK for a mild V8, but if you have something that's making over 300HP. you'll need something that supplies a bit more flow. This is because a sudden drop in pressure at the regulator can cause all kinds of problems, and if you are putting 50 lbs per square inch at the reg (as you would for a hi po engine) then you'll need an aftermarket type like a Holley ($$$$$$$). You could try a 280Z F/P (they are external) or look for a Nissan V8 internal pump and mount the pump externally on some rubber grommets (I've heard that you can do this to these Fuel Pumps, but I can't remember where I heard it, so be careful with this advice!). The main thing to watch for is pulsing of the fuel because the FP can't keep up.
Have you thought about a surge tank? You could run a Holley blue pump to a surge tank and use an internal EFI pump in the surge tank (a Nissan Patrol transfer pump for the auxiliary fuel tank would be ideal, and cheap!). The Nissan Patrol/Landcruiser options are good ones, as there are lots of spare tanks around in the LPG conversion shops, and they'll sell you the tanks for a few bucks with the fuel pumps in them.
Also try contacting Alan Gibbs at tpiconn@space.net.au or ask the same question at kalmaker.hotrodhandbooks.com.au and see if he's not too busy to respond. If anyone knows the answer, he does! He sometimes posts here, too, so he may chime in any time.
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