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Fuel pumps


ThreePointFive
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I'm just starting to get my MS build together (trying to work out what is missing from my engine has stalled it quite badly).

I have been going through Microcat and I've noticed there are several fuel pumps for petrol Defenders, some specifically for EFI, some not

I have the standard 3.5 carb in-tank pump, is this going to work with megasquirt or am I going to run into some issue with this? It's clearly defined as not being for EFI in the Catalogue, so any pointers would be a massive help.

Yes, I did try the search function first.

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Carb pump won't work, Nige has details on how to convert for EFI in his big MS build thread, I believe.

It is pretty easy to do TBH, once you have a pump or two on the bench, you can make them any length you want by adding hose and a plate of steel/aluminium.

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I fitted a volvo 850 pump I found on Ebay. I bought for £3 + 5 postage to Greece. It fits perfectly in place of the in tank carb pump with no alteration.

It was same with this one,http://www.ebay.co.uk/itm/VOLVO-850-S70-V70-FUEL-PUMP-1993-2000-INCLUDING-T5-CARS-/221182063833?pt=UK_CarsParts_Vehicles_CarParts_SM&hash=item337f7a74d9 much lower price.

I had to dismantle and fit.

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Very helpful, thanks guys. I don't know why the search function seems to find nothing I want when I use it.

What is the reason why the carb pump won't work with EFI? I had thought that as long as it pumps, it would supply the engine, which would use it?!

I might look at pricing up the 50th anniversary pump instead, as it's a LR part and wouldn't require any mods. I expect it's hideously expensive, in which case the RR EFi pump is my next favourite option.

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IIRC the fuel injection pumps runabout 100PSI, but the regulator on the fuel line drops it to 30PSI, which is what the injectors need, 7PSI, which is what I think the carb pumps produce just wouldn't produce enough fuel or spray pattern through the injector :)

I don't know, but I expect the RR pump is a LOT cheaper than the 50th anniversary one, and as you say very easy to mod.

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