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Big Al Offline
#1 Posted : Thursday, 30 September 2010 1:21:32 AM(UTC)
Big Al

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Hi all,

Just trying to nut out what I'm going to do for my fuel setup on my HQ sedan. Got an injected 304ci going in.

Where is the best spot to tap in for fuel feed line? Where is the best spot to tap in for fuel feed return? Does it need to be up near the filler neck?

I'm thinking about running an external pump similar to a VL, to aviod having to make too many mods to the tank I have. Does it matter if it is mounted higher than the tank discharge nozzle. I presume that the closer it is to the tank the better, to reduce head.

Can I use the existing feed line (ex. 202ci) as the new return line?

What size line would I need for the new feed line? Does it predominantly have to be steel line?

What pump specs do I need for a stock 5.0L? Is there an OEM pump that can be used (VL 6cyl maybe?) or will I need a Bosch or similar unit?

If anyone has any photos of their setup, that would be greatly appreciated too.

Thanks for any info, Al
Dr Terry Offline
#2 Posted : Thursday, 30 September 2010 2:13:18 AM(UTC)
Dr Terry

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I've done several of these conversions & it's much easier, neater & simpler to just use a VN-VS V6 tank complete with its internal pump & swirl pot.

You need to fit the HQ filler pipe to the Commodore tank & blank off the old filler holes & re-jig the vent hoses. Most radiator repair places can do the soldering. Then it will straight fit in using the HQ tank straps & you just use some brooker (threaded) rod to replace the old short bolts.

It might sound fiddly but it's much quieter than an external pump & you don't need an external swirl pot. The same internal pump was used for all VR to VS V6 & V8 including 5.7 HSVs so it will supply plenty of fuel.

Dr Terry

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When calculating a car restoration budget, be as accurate as you can & then double the final figure. It will be closer to the truth.
If at first you don't succeed, just call it Version 1.0
Big Al Offline
#3 Posted : Thursday, 30 September 2010 9:06:01 AM(UTC)
Big Al

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Thanks for that Dr Terry, I'll look for one to dummy up. Cheers.
Big Al Offline
#4 Posted : Thursday, 30 September 2010 7:26:50 PM(UTC)
Big Al

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Hey Dr Terry (or anyone else), do you happen to have any photos of the VN tank in the HQ??
Big Al Offline
#5 Posted : Wednesday, 6 October 2010 1:07:40 AM(UTC)
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Hi all, I bought a VP sedan fuel tank on the back of Dr Terrys advice. I dummy fitted it up to get an idea of how it would look and I'm pretty happy. I will post photos this arvo and maybe update this thread into a bit of a guide as I go along.

Dr Terry - how did you tackle the problem of the top of the drivers side of the tank stepping down in profile? I'm thinking about packing it up with a thick piece of rubber??
Big Al Offline
#6 Posted : Friday, 15 October 2010 8:51:56 AM(UTC)
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Dr Terry Offline
#7 Posted : Friday, 15 October 2010 5:55:30 PM(UTC)
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quote:
Originally posted by Big Al
Dr Terry - how did you tackle the problem of the top of the drivers side of the tank stepping down in profile? I'm thinking about packing it up with a thick piece of rubber??

Sorry, missed this earlier.

I used thin strips of high density foam between the tank & the floor in place of the old rubber. To take care of the step in the tank, I stacked 4 pieces of the foam to make up the difference. With the straps tightened up it sits firm & level.

Dr Terry.

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When calculating a car restoration budget, be as accurate as you can & then double the final figure. It will be closer to the truth.
If at first you don't succeed, just call it Version 1.0
Big Al Offline
#8 Posted : Friday, 15 October 2010 7:32:16 PM(UTC)
Big Al

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Cool, thanks Dr Terry. I presume its easiest to cut the filler neck and part of the tank itself off the HQ tank and graft it onto the VP tank? I'll have to farm this out as I don't have the equipment to do it myself.
Dr Terry Offline
#9 Posted : Friday, 15 October 2010 9:42:28 PM(UTC)
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Yeah, I just gave all the bits to my local radiator guy. He soldered everything together & pressure tested it in his radiator tank. He plugged off the un-used fittings & holes & added the new ones I needed to match the vapour hoses in the HQ.

If you are unsure, just tack it together first & make sure that the filler neck is sitting at the correct angle & is the right length.

Dr Terry

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When calculating a car restoration budget, be as accurate as you can & then double the final figure. It will be closer to the truth.
If at first you don't succeed, just call it Version 1.0
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