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| 8 & 10 cyl Bristol cars Type 407 onwards - restoration, repair, maintenance etc |
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22-03-10, 11:43 AM
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Fuel Pump in earlier V8s
Can anybody tell me where the fuel pump is located on a (V8 (410 in particular)? I suspect that the car has picked up some rubbish into the fuel system and sustained running at higher speeds has the engine misfiring and showing signs of fuel starvation. I want to check the fuel pump and replace the filter. Thanks, John Keighley
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22-03-10, 01:05 PM
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Fuel Pump in earlier V8s
Hi John,
Unless your car has been altered to an electric fuel pump, many have. The mechanical fuel pump is located on the LH side of the engine block, looking from the front. It is a Carter M2504 S on my 407 Hand book say no maintenance is normally required ( it is mechanical). The pump can be removed from the engine and dismantled and cleaned the following parts will need to be renewed at re-assembly, M.203-89S Diaphragm Assembly M.203-46 Outlet Airdome Diaphragm M.121-124 Flange gasket. The Fuel filter. Moper 2084 258 should be changed every 10,000 miles. Hope this helps, I have converted my 407 to an electric fuel pump located under the offside wing on the wheel arch. The filter is an in line particulate transparent filter located under the bonnet between the new fuel pump and the carburettor. Nick Challacombe
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22-03-10, 03:39 PM
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My 410 has an SU electric pump, located high up in the boot on the right hand side. I think some other cars also have had them fitted in the boot. The diaphragms (it's a double pump) do not last forever and I had to rebuild mine a few years ago after it failed without warning on the motorway. If it's not original, I would guess it was fitted when the car was restored circa 1990.
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22-03-10, 08:17 PM
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Fuel Pump in earlier V8s
John
My fuel pump in my 410 is in the boot as described in Sam's reply. On my 411 which was a mechanical pump but not working properly due to slight wear on the rod and cam we conveted to an electrical pump. The first attempt with a Holly pump was a disaster, mounted on the boot bulkhead it made more noise than the engine on tick over and low speeds, this was replaced with a Facet pump also bulkhead mounted and much better, just the priming sound before start up. I am told this pump would also work mounted up front near the battery but have not tried that so can't be sure.On my 410 I had the pump rebuilt with an electronic update to do away with the points and I must say it works very well. Geoff
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23-03-10, 07:41 AM
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Fuel Pump in earlier V8s
Thank you all for replying, I should have known where to look but as the car was going in to my local mechanic,didn't have time to search. It is on the right hand side of the boot floor. As it happened, the pump turned out not to be the culprit but we discovered this afternoon, the filter was almost fully blocked due to having sat around for an extended period of time. At this point, a new filter has restored normal operation. Since emerging from restoration the car has covered about 3500Ml, so I'll have to keep a lookout for crud in the fuel system.
John Keighley.
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27-03-10, 10:36 PM
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Mechanical Pump
Quote:
1843400 Fuel Pump up to Chassis No. 7350 and 909-1-33012 Fuel Pump Chassis No. 7351 on & 410 George
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28-03-10, 12:03 AM
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I didn't realise that the fitting of electric fuel pumps to V8 Bristols was so common. I suppose I shouldn't be so surprised given that you can buy a Mopar branded blanking plate for the spot where the mechanical pump goes (for B/RB engines at least). That suggests it is very common practice. It certainly makes starting the 400 CID engines much easier from cold.
I don't think it really matters what pump you have so long as it can supply an adequate flow rate and the pressure isn't too high. You wouldn't want any more than 5 psi, but you can use a fuel pressure regulator if necessary, I have one on my 411.
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