Fitted a new fpr and removed the supply side one new pump and filter but I can't start it cold. I have to clamp the return hose to get it running. Then I removed the clamp and it's fine untill the next cold start any ideas anyone?

 

Well, this certainly suggests lack of fuel pressure....which suggests the regulator is faulty. Was this problem occurring with the old regulator?

Cheers
DD

 

Rex
What seems strange to me is the OK running once actually started; so I think i would change the ECU's engine temperature sender on the B bank thermostat housing first; it might not be telling the ECU that the engine is stone cold and so the ECU is not enriching the mixture.

If this makes no difference I agree with Doug, this sounds like a duff new FPR; but:
Do you give it two pump priming goes on the ignition before trying the start it? Does it start if you floor the throttle while cranking? If all this is yes, then:
When you changed the pump did you clean out the sump tank and change the filter?
Did you blow out the supply line?

They never let you get complacent, do they!

 

I checked all the vacuum and connectors under the r.h.inlet followed the wire to the throttle pedistal disconnected the plug and checked the wiring and reconnected it, cleaned the temp switch connections eac3762.... I tried it again and it started. Bloody messing with my mind now. I try it again tomorrow 😋🤪🤪🤑

 

Hi rgp

Sounds like you had Corroded Contacts on the Water Temperature Sensor (give them a clean with Lemon Juice@Grant)

 

Which side is this pls. I have a temp switch on the rear of the R.H. manifold temp gauge sender R.H. front and a temp sencer L.H. front.

 

LHS B BANK thermostat housing, the plug that looks like an injector plug.

 

Connections all OK. Checked fuel pressure seems correct at just over 30psi and with the contraption fitted it started, I will see if it starts when I remove it.


Engine running but hunting R.H.exhaust

 

I think the f/p is actually a bit low. You're looking for something along the lines of 36 psi.

Cheers
DD

 

It ran this morning badly petrol fumes stung my eyes. It would rev then i stopped lt and it wouldn't start again. This was the pressure after switch off

 

I think, therefore, duff new regulator, partially blocked filter, failing pump, or partially blocked gravity fuel feed from main tank to pump.
Personally, I heartily dislike the OEM style Bosch canister filters, ever since I had a duff brand new one on a Range Rover, that took me forever to diagnose as the cause of a high speed misfire.
These, with the 8mm barb adaptors i love:
https://www.merlinmotorsport.co.uk/p...e-ports-sbf001
with
https://www.merlinmotorsport.co.uk/p...ilters-bulla02

 

Turned out that when I removed the steel vacuum pipe that runs down the r.h. chassis rail I inadvertently pulled one of the clips away from the resister pack.

 

So all OK now?