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GrahamBurn
Unregistered guest
Posted on Sunday, 11 September, 2022 - 21:11:   Edit PostDelete PostView Post/Check IP

Hi all, it's been a while as other projects and life has got in the way but I'm finally back on the Turbo R, 1987.

Been in dry storage for about 2 years, drove in no problem but when it came time to revive it she turns over fine but doesn't fire. I have spark but no fuel, went through the electrics as best I could and all seems to be OK, tried the jumper from the washer motor to the start inhibit relay socket as per the manual and no pump run.

Went underneath and powered the pressure pump directly and discovered it's seized, I had a spare pump in the garage for another project but it turned out to be identical so removed the old pump ready to fit the replacement.

When I was removing the pump I discovered a second wire coming down through the floor with the power lead to the pump. The wires are very dirty so not sure about colour will need to get some solvent to see what they are the end of the spare wire has a cylindrical plastic plug on the end with a corroded terminal in the centre of a recess in the end, any idea what this could be?

I'm wondering if it's the supply to the in tank pump as with the pressure pump disconnected I couldn't hear it run with the jumper in place and ignition on?

TIA Graham

(Message approved by david_gore)
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Graham Burn
Yet to post message
Username: grahamburn

Post Number: 1
Registered: 09-2022
Posted on Thursday, 15 September, 2022 - 21:49:   Edit PostDelete PostView Post/Check IP

Replacement pump all assembled ready to go on tomorrow, any suggestions about the other wire which was all taped up alongside the power lead to the pressure pump, haven't been back to the car as other projects have taken priority. I can't read the cable colours on the fuel pump wiring diagram, if someone could post a copy with the colour codes clearly marked it would be a great help.
Thanks
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michael vass
Frequent User
Username: mikebentleyturbo2

Post Number: 765
Registered: 07-2015
Posted on Friday, 16 September, 2022 - 17:39:   Edit PostDelete PostView Post/Check IP

Are they both original wires?
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Graham Burn
New User
Username: grahamburn

Post Number: 3
Registered: 09-2022
Posted on Saturday, 17 September, 2022 - 06:12:   Edit PostDelete PostView Post/Check IP

Hi Michael as far as I can tell yes as they match other wires in the area, bound in loom tape coming down through a grommet in the floor forward and to the right of the tank out let where I believe the in tank pump is located? Don't want to disturb that if I can help it as it looks a bit tired.
I removed the cover panel in the boot but all I found on the back face of the tank were the fuel level sensor wires, at least I assume that's what they are as they are small gauge I would axpect the pump leads to be a bit heavier. Where do the pump leads for the in tank pump enter the tank? I can't find any details of these in the fuel system sections.
Graham
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michael vass
Frequent User
Username: mikebentleyturbo2

Post Number: 766
Registered: 07-2015
Posted on Saturday, 17 September, 2022 - 08:15:   Edit PostDelete PostView Post/Check IP

Hi Graham
I'm sure there is only one pump.
I'd like to know any colours you can see on the wires.
Good luck Mike
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Robert J. Sprauer
Frequent User
Username: wraithman

Post Number: 802
Registered: 11-2017
Posted on Saturday, 17 September, 2022 - 09:59:   Edit PostDelete PostView Post/Check IP

Your Turbo does not have a pump within the fuel tank. Whenever you want to verify what your vehicle has....reverse engineer it. Simply go on the Bentley Heritage site and plug in your VIN number and all the parts for your car will appear by category.
Here is your pump:

https://heritage.bentleymotors.com/en/catalogue/partCatalogue/5415?chassisNumber=SCBZS0T09HCX20018#search-by-categories
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Graham Burn
New User
Username: grahamburn

Post Number: 4
Registered: 09-2022
Posted on Sunday, 18 September, 2022 - 03:26:   Edit PostDelete PostView Post/Check IP

Hi both, thanks for the link Robert, I was going by the information in the technical manuals downloaded from this forum which appeared to indicate a booster pump in the tank but if the Turbo R is not fitted with one it makes life much simpler!
Alarm bells rang when I removed the seized pump and there was a yellow crimp ring terminal on the positive supply lead to the pump where a blue would have been more appropriate and this second wire taped up in a suspicious manner. When I get back under to fit the new pump I'll try to get the colour of this second wire which might give a clue as to where it should go.
Thanks again
Graham
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Graham Burn
New User
Username: grahamburn

Post Number: 5
Registered: 09-2022
Posted on Monday, 19 September, 2022 - 04:08:   Edit PostDelete PostView Post/Check IP

OK managed to get to spend some time under the Bentley today to fit the replacement pump, successfully flushed the fuel lines to the engine using the jumper, once I had fuel to the injection system I reconnected the pipes and ran the pump again to purge any air from the lines and back to the tank, replaced the interlock relay and she started up first turn of the key! So next job is get the car back to my workshop and continue where I left off with the bodywork repairs and hopefully get the front wings and bonnet painted.
It turned out the extra wire was in fact 2 wires, one black and the other white/pink, the black had a female spade connector inside a plastic plug so I'm guessing that the wiring is there for the in tank pump which mine doesn't have. I'm afraid I get a bit paranoid when I find dodgy wiring which looks like a bodge!
Anyway the beast lives so on to the next stage.
Many thanks for your help in helping to resolve my dilemma!
Graham
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Darryl Watson
Experienced User
Username: inox

Post Number: 191
Registered: 04-2015
Posted on Thursday, 06 October, 2022 - 00:11:   Edit PostDelete PostView Post/Check IP

Just a thought
Our 1990 Mulsanne S is fitted with two fuel pumps. Should your car have two and it's minus one?
Regards,
Darryl

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