12 replies to this topic

[mdj]

Hi,

 

So I'm relatively new to EFI conversions but I'm working my way through Sniper EFI on my 202 ...

 

Have most of the under bonnet wiring planned out, which leaves the fuel side which I'm planning to be a VE Commodore MRA (pictured) with a conversion kit for the factory tank.

 

So I have two questions really:

 

Is there any external connecting "thingo" for the hole on the MRA I need to get or does it really just sit as is in the tank and absorb fuel into its own swirl pot ?

 

What's a good non-ugly way to attach a new fuel line run to the floor ? I'm planning to go down the passenger side as it's a six and I'm leaving the factory fuel line in place in case I move to a return system later.

 

Thanks in advance I'm sure plenty of you have done this before !

 

Matt

Attached Files

•  mra.jpg   68.97K   4 downloads

[yel327]

On my HK I’m running a new line down the passenger side and just mirroring the line off the other side. This new line will be by breather line to a VN charcoal canister (venting the tank and the VZ MRA using this line). I’m replacing the factory line with a larger one as it’s a 385ci engine. I can’t recall LX/UC exactly but I think you can do the same but use the new line for fuel.
Note a VE MRA is return less, as in no return line needed as it’s regulated at the MRA.
Not sure about that spout on the VE MRA, the VZ doesn’t have it.
On the VZ the MRA feeds a filter and the other side of the filter has a T on it, one side feeds back to the MRA and the other side of the T to the fuel line. VE should be similar.

Edited by yel327, 01 November 2023 - 06:41 PM.

[mdj]

On my HK I’m running a new line down the passenger side and just mirroring the line off the other side. This new line will be by breather line to a VN charcoal canister (venting the tank and the VZ MRA using this line). I’m replacing the factory line with a larger one as it’s a 385ci engine. I can’t recall LX/UC exactly but I think you can do the same but use the new line for fuel.
Note a VE MRA is return less, as in no return line needed as it’s regulated at the MRA.
Not sure about that spout on the VE MRA, the VZ doesn’t have it.
On the VZ the MRA feeds a filter and the other side of the filter has a T on it, one side feeds back to the MRA and the other side of the T to the fuel line. VE should be similar.

I was thinking the spout might be the outflow of the regulator since as you say it's a dead-end system. There's only a single hose connection on top.

[yel327]

Might be. My VZ MRA has 3 spouts: vent, out and return. See here:

 

Fuel level float on MRA - Engine - GMH-Torana

 

I can see what you mean on the VE pump in this link:

 

EFI Fuel Tank Conversion Kit to suit VE Fuel pump 155mm to 180mm high (efihardware.com)

[yel327]

Found these too, for VT-VX and VZ onwards.

 

The VE one doesn't have similar images.

 

 850-120S.pdf   143.45K   1 downloads

 

 850-121S.pdf   586.17K   0 downloads

 

That big port under fuel must be a quick fill venturi or something. The VE tank must vent off a higher point in the tank, whereas the VZ MRA is the highest point hence why it has the breather on it. 

[Bigfella237]

The fuel tank in a VE is split over the tailshaft hump isn't it? Might the extra fitting be something to do with transferring fuel from the other side?

[yel327]

Hard to see how it'd be connected though, its not like it's easy to get your hand in there once the MRA enters the hole. In photos I can see it looks like they have two drop in units, maybe one pumps from one side to the other?

[LJ RB30]

From memory the VE’s second unit in the other side of the tank is just another pick up connected by an internal hose to main pump & they both have a fuel gauge sender

[yel327]

From memory the VE’s second unit in the other side of the tank is just another pick up connected by an internal hose to main pump & they both have a fuel gauge sender

 

That will explain the spout on the side of the MRA.

[Bigfella237]

Seeing as that second "spout" looks higher than the inlet on the MRA itself, you would probably need to block that off altogether. Otherwise you'll be sucking air long before the main inlet normally would.

 

If that's the case, then there is probably good reason behind people using a VZ unit rather than a VE/VF.

[mdj]

Seeing as that second "spout" looks higher than the inlet on the MRA itself, you would probably need to block that off altogether. Otherwise you'll be sucking air long before the main inlet normally would.

 

If that's the case, then there is probably good reason behind people using a VZ unit rather than a VE/VF.

I chose the VE one entirely on measuring the depth of the standard UC fuel tank. A VZ one would suit a drop tank I preferred the idea of having an external regulator as I was going to make a bracket to install it where the 202 fuel pump goes so the whole thing would look stock and use the original fuel line for return. Since I ended up just going for the Holley Sniper, it has a regulator built in anyway so scratch that plan.

 

Strange that the EFI Hardware kit doesn't have a bung for it. Might give them a call this arvo and ask.

[yel327]

EFI hardware sell you the appropriate unit depending upon the height of the fuel tank its going into. If you have a really tall tank like a HK-HG you use a VT-VZ one, and for those you have a choice of the old-style return setup or the more modern returnless from VZ. If the tank is mid height you use the Ford style, which I think is a return style. Then if its short you use a VE MRA, which are all return less.

 

I chose the returnless VZ as its easier, plus my Sniper doesn't have an integral regulator anyway, so its easier and neater to do it at the tank MRA. With the basic style square bore Sniper they have an integral regulator but it'll still work fine with a regulated MRA, all they need is 60psi, if it doesn't need to regulate it won't.

 

I'm still not sure what you'd do with that spout on the VE MRA. EFI Hardware would know.

[mdj]

I'm still not sure what you'd do with that spout on the VE MRA. EFI Hardware would know.

So the official word is yes the spout the connector from the unit on the other side of the saddle tank. It's fine to leave it disconnected as the pickup is below it anyway.