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It's only 6 bar (85psi) so no use for the Lucas mechanical system where you're looking for at least 100psi. I think with fuel pumps you probably get what you pay for...genuine Bosch part = quality. You need a Bosch pump that was designed for the old K-Jetronic system that can run continuously at high pressure all day long.
You're right about the location. Bosch pump doesn't like to suck so you'll need to get a good gravity feed and, ideally, fit a pre-filter as well as the post filter. I've fitted one in the spare wheel well of my TR6 and wheel still fits (see picture), but can't recall if there is sufficient room in the Stag. The alternative is to locate it under the boot (many do) with the added advantage of extra cooling. The Bosch part numbers are 0 508 254 910 or 0 508 254 909 (and probably others) - you just need to check they can deliver up to 10 or 11bar. Suitable pumps were fitted to loads of fuel injected cars e.g. Golf/Scirocco, Audi 80/90, Volvo 240/740, most 1980s Mercedes, Capri, XR3 etc. Another thing to watch is that the Bosch draws quite a bit more current than the Lucas so make sure the wiring is up to the task - put it on a dedicated circuit via the inertia switch.
Hi Bill, or anyone who knows and can help,
Looking at the picture is the black part the pump and the white part another filter as if not it looks like there is one filter going to another filter although I cannot see the rear of the pump/filter but I assume that the fuel comes from the tank, through the small filter, through the pump and then through a larger filter them off to the MU via the PRV. Ref fitting the Bosch pump as low as possible, on my Stag the fuel feed comes out of the top of the tank. I know this feed draws the fuel from the bottom of the tank but will the Bosch pump be OK to "suck" the fuel up via this feed, I think things will be OK as there would be a "Siphoning” effect but wanted to make sure as due to the location of the Bosch pump and re-plumbing required I wanted to be as sure as possible that I am locating the pump in a good position as to have to tap into the tank at the bottom would be a real pain.I have found the Bosch pump 0580254910from Burton Engineering at a good price, I have e-mailed them to ensure that this is a genuine Bosch part and am awaiting a reply before I order. The Burton page is, https://www.burtonpower.com/product_...Txt=0580254910
Your assumption is correct. Fuel is gravity fed via small pre-filter to the (black) pump and then passes though the high pressure filter to the PRV and beyond. The Bosch pump will not suck, so it absolutely must be gravity fed. As long as the pump is located below the level of the bottom of the fuel tank it will work ok. Alternatively, I've seen examples where a facet pump is used to feed the main pump. With the PI system you'll get better reliabilty with regular changes of the pre-filter - mine's got a glass case so I can easily see how much crud is present, it's surprising how much crap there is in petrol! Also, resist the temptation to run the fuel level low - the more petrol, the better the gravity feed to the pump, plus the lower fuel temperature will minimise cavitation. The set-up in the picture works absolutely fine and will happily pump 105psi all day long - it got me to Le Man Classic (and back) last year.
As Bill says he has a pre-filter and a post pump filter, so the black one is the pump. On the Stag it is difficult to know where to put the pump. Mine was located outside underneath, near the diffbut it always got in the way when doing other work, and it had to have a shield fitted to keep off the road dirt. I relocated it back to the original pump position, for neatnessand that worked OK for a while, but after storage, the fuel dropped back, and the pump would not suck it back again. Is there room in your tyre well to fit one? That should work OK.
Sorry for the three posts, not yet worked out how to get more than one picture per post.
Hi Bill & VMad,
Many thanks for your replies and information, I have shown two pictures of the pump etc in my Stag boot area. As I like to keep things as easy and as simple as possible it looks like all I need to do is to remove the Lucas Pump and brackets etc, fit the Bosch pump on the boot floor, connect the PRV to the output of the Bosch pump and keep all existing pipe work, probably need to extend some of the pipes. My only concern is the Bosch pump having to “suck” the fuel through the filter as shown. I know I could re-plumb but if all I need to do is to replace the Lucas pump with the Bosch pump to the existing pipe work and locate on the boot floor why make things complicated for myself ?. There is room to fit below where you see( slightly to the rear )and still allow the spare wheel to stay where it is.Any comments as always appreciated.
As the others have said you will need the pump below fuel outlet level as the Bosch pump will not lift the fuel. My PI Estate has the same fuel tank as the Stag and I have had to stick with the Lucas pump as I did not want to do major modifications.
I would have a chat with Malcolm at Prestige injection as he specialises in the Triumph PI system. His number is:
(01978)263449
I am lucky as I only live about 3 miles from him!! He has a website too
I've had a look in my Stag boot today, and I'd be inclined to locate the pump underneath. The pump is completely sealed and that was where it wassuccesfully fitted to many cars in the 1980s. Will obviously need the plumbing re-worked, but not difficult. I'd get rid of the lucas filter set-up completely and use a high pressure post filter designed to work in conjunction with the Bosch pump.
I can also recommend Malcolm at Prestige - top man and knows his stuff.
If you've got a branch of Pirtek near you, they'll have all the BSP fittings you need and will make up any high pressure fuel hoses to order.
I have sent an e-mail to Malcolm seeking advice. I do have access to a company who does high pressure pipes connections etc so not a problem getting these sorted. I suspect I am having an old fart brain fade moment but looking at relocating the pump below, I could see the possibility of fitting in front of the boot / tank but this would not be any lower than the inside boot / tank area, to get lower that the boot / tank area would mean the pump would be very vulnerable, i.e. something in the road or am I missing something ( apart from brains cells ).
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