9 replies to this topic

[Suni]

Hi,

 

I am after peoples real experiences when mounting an electric fuel pump mounted just above the rear diff fixed through the rear boot. I know this can be a common way of doing it. This is the way I would also like to do it because it could be the only spot I can fit it.

 

Has anyone had fuel issues doing this? Car is LX red 308 engine pretty warm. Standard fuel tank.

 

Thanks for your replies

[Bigfella237]

G'day Suni. What pump? What filter(s)? What size line?

 

And what are you asking about exactly... are you talking about physical space (eg diff/suspension clearance), or fuel delivery, or water ingress/corrosion, or thermal problems, or NVH, or pump life, or voltage drop issues, etc. etc.?

[Suni]

Its a Holley Fuel pump. Unsure of exact details. the potential concern I have is due to the idea the pump needs to be ideally lower than the fuel tank. Will  just above the rear diff as I previously mentioned be too high to work properly and cause me engine damage due to bad supply? 

 

I know many people have mounted in there and it could potentially be fine. I want to hear from peoples experiences who have or know the results of mounting there. 

 

Thanks

[rexy]

I have a Holley blue in that exact spot in my hatch.

Plenty of room. No issues with fuel supply.

 

The old style Holleys are very noisy though, even with rubber insulation/damper.

Replacing it with something quieter is on my non urgent to do list.

[Suni]

I have a Holley blue in that exact spot in my hatch.

Plenty of room. No issues with fuel supply.

 

The old style Holleys are very noisy though, even with rubber insulation/damper.

Replacing it with something quieter is on my non urgent to do list.

Thank you for your response. I am not too keen on fuel tank modifications if I could avoid it for a few reasons, cost and time. I am almost at the end of my full running gear conversion on my hatch. I am getting a little toey wanting it all done so I can hit the road!

 

The old 202 has been replaced with an Aussie pattern red 308 engine, Tremec TKX gear box and VS Borg-Warner rear diff housing with a kaaz lsd inside. Costs and time have blown out, realistically always as expected I guess in the muscle car game.

[VZ1_60]

I have a Holley blue in that exact spot in my hatch.

Plenty of room. No issues with fuel supply.

 

The old style Holleys are very noisy though, even with rubber insulation/damper.

Replacing it with something quieter is on my non urgent to do list.

Agreed, I ended up replacing mine with a Facet, also Holleys usually like to be gravity fed, they are not the best "lift" pump

[76lxhatch]

I've had a high volume Carter above the diff for many years and never a problem. Was initially feeding a carb, is now the lift pump to an external surge tank for EFI.

 

[ozyozyozy]

Get rid of the holley and fit a carter, nice all round pumps, not too noisy, depending how warm or hit the engine is to what size pump.
There is a formula you can google for rough gallons per hour(GPH) for engine power, to work out pump size.

[Dr Terry]

Yes agree 100%, Holley (& Facet BTW) are way too noisy, I don't know how they can still sell them after all these years.

 

The Carter is a much better pump. I ran one on our old drag car. It had 2 Holley carbs on a tunnel ram & 4 plates of nitrous & we never ran out of fuel flow.

 

Dr Terry

[VinnieSLR]

I've had a high volume Carter above the diff for many years and never a problem. Was initially feeding a carb, is now the lift pump to an external surge tank for EFI.

I'm running the exact same setup (Carter pump and position). Runs perfectly fine and pump isn't too loud 👍🏼