fuel pump doesn't work

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Re: fuel pump doesn't work

Postby lotusflasherman » Mon 06.03.2017, 01:06

Rambo wrote:I forgot to mention that my non starting/fuel pump problem has now been fully resolved. The problem was very simple in the end :oops: :oops: :oops:

Anyway, thanks to all LEC'rs who helped with their suggestions



and... it was what? We need to know to help others... :poke:
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Re: fuel pump doesn't work

Postby dapinky » Mon 06.03.2017, 01:17

lotusflasherman wrote:and... it was what? We need to know to be able to take the p1$$... :poke:
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Re: fuel pump doesn't work

Postby Rambo » Mon 13.03.2017, 22:03

dapinky wrote:
lotusflasherman wrote:and... it was what? We need to know to be able to take the p1$$... :poke:


It’s a bit of a long story really but for those that want the quick answer....

it was the fuel pump relay...... but if you want the long answer and the solution, then read on....

After doing all the usual checks I came to the relay and couldn’t find it !! I eventually came across it on the floor of the battery compartment near the inertia switch !! I couldn’t work out why it had come out but, anyway, I checked where it should be on my other car and saw a similar FP relay through the 3cm hole cutaway in the plastic cover by the bulkhead

So, I went back to the knackered car and put the FP relay in the same position, turned the key and expected it to start. No FP relay noise !! I then swapped the relays round to check and still nothing !!

I then went back to my NMY and turned the ignition with the FP relay not in place. Guess what, FP whirr and the car started. WTF ??

And then I thought this can’t be the correct position for the FP relay so prised back the plastic cover further and found an identical relay to the LHS. I came to the conclusion that my NMY had a spare relay for some reason ???

I went back to the black one, slotted the FP relay in the correct socket, turned the ignition, FP primed/whirred and engine fired 1st time

So it was the FP relay all along. It's just my ignorance and lack of understanding. But, at least I now know where the relay should go :oops: :oops:

OK, time for the pi$$takers to have their say. Cue Geoff, Dapinky, Lotusflasherman et al..... :lol: :lol:
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Re: fuel pump doesn't work

Postby dapinky » Tue 14.03.2017, 10:38

Rambo wrote:OK, time for the pi$$takers to have their say. Cue Geoff, Dapinky, Lotusflasherman et al..... :lol: :lol:


In this case, I don't think taking the pi$$ is a viable option.....

.... you had an issue, tried to sort it, asked advice, then sorted out your problem - good drills!

If it had been the inertia switch, fuse or something else which a man of your experience should know to check, then much 'taking' would take place.....

So, in summary - you had a problem, you sorted it out after following the appropriate steps, you're back on the road, and others may now follow a similar route to get going - isn't that what this forum is for?????
Dave

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go on - click this link - you know you want to!
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Re: fuel pump doesn't work

Postby Rambo » Tue 14.03.2017, 18:43

Yes, of course it is Dave. That's exactly what the forum is for

I was pleased to solve the problem eventually and it taught me a thing or two along the way. Who says "you can't teach an old dog new tricks" ?
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Re: fuel pump doesn't work

Postby Xavier T » Thu 08.06.2017, 23:22

the problem has been solved. It was a bad positive wiring.
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Re: fuel pump doesn't work

Postby JossElan » Sun 08.10.2017, 13:56

Hi all,

Similar problem - trying to fix on a mates drive. Turn on ignition, no fuel pump buzz, no engine light. Turns over but doesn't start.

I've checked resistance from + post to relay (okay) and have shorted the relay and fuel pump buzzes but doesn't start. Still no engine light.

Any ideas?
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Re: fuel pump doesn't work

Postby JossElan » Sun 08.10.2017, 14:17

Right, fault tested the whole fuel pump diagram. Although haven't been able to test the relay.

I assume that the immobiliser circuit is spliced into it somewhere (sigma). Any ideas?
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Re: fuel pump doesn't work

Postby JossElan » Sun 08.10.2017, 14:27

(Central locking works from key fob)
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Re: fuel pump doesn't work

Postby dapinky » Sun 08.10.2017, 17:19

Joss,

I can't help with your problem, but just wanted you to know that you aren't talking to yourself :?
Dave

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Re: fuel pump doesn't work

Postby JossElan » Sun 08.10.2017, 18:28

Thanks buddy! RAC here now.
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Re: fuel pump doesn't work

Postby JossElan » Sat 14.10.2017, 19:06

Well, got recovered back home, but no better off.

I want to check that it isn’t just a loose connector somewhere - Anyone got a wiring diagram of the Sigma M30? (And any advice where it’s all located?)
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Re: fuel pump doesn't work

Postby e42 » Wed 15.05.2019, 22:12

Hi, resurrecting this very helpful thread since I also have a problem with my fuel pump not working (S1 SE).
I'm not very technical, apologies in advance for what are probably some daft questions, but here goes...

I have just had the car back from service and MOT and looking forward to some use - attempted to start the other day and no buzz from over my shoulder, cranking fine but wouldn't fire.

I've tried to follow the steps in this thread, as follows:

Checked fuse 3, fuse and connections to the fuse block are fine
Bought a multimeter, removed carpets, trim, hood storage compartment floor and exposed the wiring to the fuel pump
Removed the negative and positive (green/white wires), connected the multimeter to the connectors and switched on the ignition - 10.2 volts showing with ignition on, seemed safer than running wires from battery to pump?

So, assuming that 10.2 volts is sufficient to run the pump (battery showed 12.6 volts across the poles at source) I guess that I need a new pump?

I checked on SJ Sportscars site - they recommend a pump (A100L6047S) at £95.94 inc VAT, Merlin Motorsport have a 'motorsport upgrade' pump (ITP056) at £89.80 plus VAT (Nippon) - any recommendation either way? Merlin do state that this pump is suitable for S2 Elans from 1994 but not sure whether this may still be a better bet for performance if it would work for my S1?

I'll also change the fuel filter while the area is in bits, the excellent Wikilec article on replacement has the parts needed hence I think I'm ok with that part of the process.

So, anything else I might try before committing to a new pump, and any recommendations from experience regarding which pump may be best?

Thanks in advance for any advice,

Dom
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Re: fuel pump doesn't work

Postby Brit-Car-Nut » Wed 15.05.2019, 22:58

10V means you have a problem: dirty connection or bad ground/earth or bad relay.

Once it triggers the first time, it won't run again until the fuel pressure drops, so don't expect it to hum all the time before the car starts.
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Re: fuel pump doesn't work

Postby Fredjohn » Thu 16.05.2019, 00:06

Silly question/suggestion: have you tried to reset the inertia switch?
Given you do have voltage readings, it may be irrelevant however.
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Re: fuel pump doesn't work

Postby e42 » Thu 16.05.2019, 13:24

Hi, the inertia switch is ok, re the bad earth I’ll investigate but I guess that the pump would still run with 10v?
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Re: fuel pump doesn't work

Postby Brit-Car-Nut » Thu 16.05.2019, 16:52

Have you cracked the fuel line at the filter? Does (Did) it have pressure built up already?

I would suggest you check the voltage using a different ground (earth) and a different feed to see if all voltage is low or just the pump circuit.

Are you testing the power with the fuel pump plugged in or at the disconnected connector? If the pump is seized, the voltage will read low if you are testing while the pump is still connected.

If the "other" voltage reads 12V or more, then test the pump circuit again using the different earth point.

The pump is fairly common in the US. It was used on a lot of GM cars and Volvos in the '90s.

Look at this for a suggestion of what to look for to get a reasonably price pump:

https://www.ebay.co.uk/sch/i.html?_from ... 9&_sacat=0

I found the "pump end filter" like that shown in the listing doesn't fit the small "fuel well" in the M100 tank, but if you search for other Volvo filters, there are several that are more square shaped and they fit fine.

Like this one:

https://www.ebay.co.uk/sch/i.html?_from ... 9&_sacat=0
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Re: fuel pump doesn't work

Postby e42 » Fri 17.05.2019, 11:56

Hi, thanks for the advice - I've made some progress (I think) -

I haven't disturbed the fuel line yet, I'd prefer to leave that as a last step tbh.

I checked another circuit (stereo amp in the boot) - 12.09V
Poles across the battery using the multimeter - 12.09V
Earth lead direct from battery earth to neg fuel pump terminal - 10.11V - hence a drop with the pump circuit
Voltage at negative disconnected connector - 10.11V with ignition on
Zero voltage on the positive disconnected connector on the while/green wire with ignition on
10.11V on the positive disconnected connector on the black/green wire with the ignition on

Should the white/green wire have power rather than the black/green wire?

I think I'm getting confused now!

Dom
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Re: fuel pump doesn't work

Postby Brit-Car-Nut » Fri 17.05.2019, 12:39

The white-green wire will have power only when the ECM is telling the fuel pump relay to turn on AND the inertia switch hasn't tripped.

The ECM turns on the pump for a moment (to prime it) when you go to start it and then not again until the engine is running or the residual pressure is very low. So, if you turn on the ignition, the pump is primed and then it is turned off until the engine starts or the pressure is significantly reduced.

This is why I asked you if you had opened the fuel line.

Fuel Pump Circuit.jpg
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Re: fuel pump doesn't work

Postby e42 » Fri 17.05.2019, 15:12

Hi, thanks for the clarification. I decided to do the 'fuel pressure relief procedure' as described in the service manual before opening the fuel line, i.e. tripped the inertia switch and cranked over the engine for 60 secs. I then checked the white/green connection in case this had reduced the pressure enough to re-prime the pump, no voltage showing. Then, I tried again to connect directly from the battery to the neg terminal on the pump housing and the white/green terminal - and the pump ran!

Sounded nice and quiet, I then tried to start the car, it fired straight away and then faltered and stopped after 2 or 3 seconds. Same thing happening twice more, then the car fired and stayed running. I let it run for 20 mins, all ok, then left it for 30 mins, tried again, all fine!

So, the car runs, but I'm not convinced that the problem has been solved, I wonder if getting the full whack from the battery directly 'jolted' it into life?

I guess I should at least try and track down the poor earth connection while the luggage compartment is in pieces to get the full voltage available from the battery into the pump circuit.

Dom
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