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Old 15th February 2020, 11:57   #21
p2roverman
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Quote:
Originally Posted by T-Cut View Post
You might try measuring the fuel delivery pressure at the Schrader valve. It can be done using a mechanical tyre pressure gauge (NOT a digital/electronic one = fire hazard). Get an assistant to turn the ignition key to position 2 while you carfully hold the pressure gauge to the valve. While the pump runs, you must see at least 50psi pressure. If not, I'd suggest you think about a new pump.
You said it's got the earlier type fuel filter. Did you see it yourself?

TC

Now tested the pressure with a gauge on the Schraeder valve, pressure immediately builds to 20psi . Engine started (bit reluctant as battery was down) but ran for only a few seconds before dying. Pressure maintained at 15+psi.
So, is it a fuel pump issue; if 50psi is required then presumably yes.
As to the filter, yes it is the older one with the two loops.
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Old 15th February 2020, 13:10   #22
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Similar to mine ... https://the75andztclub.co.uk/forum/s...=286990&page=3 - in my case the actual pump was fine but some bayonet connectors had worked themselves loose. Later talked to an ex-Rover mechanic who reckoned he's seen it before when the filters (early type) became clogged-up. Never did anything to the filter and the car is still in almost daily use.

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Old 16th February 2020, 14:23   #23
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So, is it a fuel pump issue; if 50psi is required then presumably yes.

Yes. It needs 50psi minimum to run.


TC
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Old 16th February 2020, 15:55   #24
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Yes. It needs 50psi minimum to run.


TC

Hmmm, I now wonder if my regulator is overpressurising the fuel rail and causing the high emissions problem. Must look into that... Thanks for the info!
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Old 16th February 2020, 18:42   #25
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So, is it a fuel pump issue; if 50psi is required then presumably yes.
I'd say possibly. It's safer to say that it's a problem inside the fuel tank. I remember someone recently finding a disconnected internal hose which affected the fuel delivery pressure. I would be cautious about spending money on a replacement pump until you have checked all other possibilities.

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Old 18th February 2020, 17:42   #26
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I thought a camshaft sensor failure only could cause non starting but not cut outs as described - whilst a failing crank sensor can cause no starts and cut outs But the PSi for the fuel pump does look too low.
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Old 19th February 2020, 01:32   #27
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Quote:
Originally Posted by p2roverman View Post
Now tested the pressure with a gauge on the Schraeder valve, pressure immediately builds to 20psi . Engine started (bit reluctant as battery was down) but ran for only a few seconds before dying. Pressure maintained at 15+psi.
So, is it a fuel pump issue; if 50psi is required then presumably yes.
As to the filter, yes it is the older one with the two loops.
Hi Mike, if that's the case then it's got to be one of 3 things, either the fuel pump has given up the ghost, the filter is blocked or it could be the fuel pressure regulator on the fuel rail that is restricting the pressure.

If you test the pressure at the Schraeder valve that's after the regulator, I'd be inclined to test the pressure before the regulator
If the pressure is still low then it must be one of the first two

Also bear in mind that the in-tank pump has a pressure release poppet valve on the top of the pump insert if this is stuck open you won't get enough pressure also, if it sticks shut it can lead to too much pressure both events are rare but can happen

Happened to me once, blew the fuel filter apart as the pressure exceeded 130 psi

Changing the pump fixed the issue.

Russ
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Old 2nd March 2020, 19:23   #28
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Hi Mike, if that's the case then it's got to be one of 3 things, either the fuel pump has given up the ghost, the filter is blocked or it could be the fuel pressure regulator on the fuel rail that is restricting the pressure.

If you test the pressure at the Schraeder valve that's after the regulator, I'd be inclined to test the pressure before the regulator
If the pressure is still low then it must be one of the first two
Russ

I wondered about filter blockage bearing in mind some of the petrol in the tank could be two years old.


Where is the pressure regulator, and is there a take off point where I can attach a pressure gauge? I have one with several types of srcew connections including the schraeder valve.


Looks like I'll be going into the tank. What a complicated system but thanks to T-cut's diagram and the RAVE DVD I can now see how the supply system works.
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Old 23rd March 2020, 15:44   #29
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Also bear in mind that the in-tank pump has a pressure release poppet valve on the top of the pump insert if this is stuck open you won't get enough pressure also

Had a further look at this problem today. Fed the pump with an external 12volt source, hesrd it running but seemed to be much quieter than the other car. Absolute zero pressure registered at the schraeder valve.

So is my best approach to investigate the pump for the pressure relese valve or check the filter side? Neither a job I relish as there seems to be a lot of pipework and electrical connection inside the tank.


Also, does anyone make or supply the special tool for undoing the rings holding the pump and filter in the tank? Might it be a tool standard to the industry I can get from a good moyor factors ot tool supplier?
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Old 23rd March 2020, 16:39   #30
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Originally Posted by p2roverman View Post
Also, does anyone make or supply the special tool for undoing the rings holding the pump and filter in the tank? Might it be a tool standard to the industry I can get from a good moyor factors ot tool supplier?
It's special tool number 19-009 in RAVE (p19-2-22 Repairs) - you won't find one in a motor factor. Someone here made one and posted a pic - it might have been Arctic or Stocktake, or anybody else (I can't remember ).



EDIT

This could be it - https://www.worthpoint.com/worthoped...-lrt-497124747 - it's the right shape anyway.

https://www.dingocroft.co.uk/acatalo...ZZLAS6110.html

Looks like I was wrong - you can buy it after all (assuming this is the right one).

Last edited by Blink; 23rd March 2020 at 16:45..
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