Daf
|
| posted on 27/2/16 at 06:41 PM |
|
|
Fuel pump or pressure regulator
Ok so I have a dilemma! When the fuel pump stops the fuel pressure drops to 0 almost straight away - now other than a leak (I'm certain
it's not this) this could only be fuel pump or pressure regulator. The pressure regulator is a standard ford item on the end of the fuel rail
and the fuel pump is a cheap eBay Bosch knock off one, ordinarily I'd suspect the pressure regulator but with my experience of cheap eBay bits
I'm not so sure - I've never looked inside a fuel pump so I don't know what goes on in there.
I'm hoping the collective on here will have some experience to help me guess which one to change first. I've tried clamping the hose
either side of the pressure regulator to see if it makes any difference to pressure drop speed but can't seem to get it to make any difference.
It seems to hold a steady 4bar when the pump is running (seems a bit high for a std ford pressure regulator but I dont trust the accuracy of the
gauge!)
Thoughts welcome
|
|
|
|
|
coozer
|
| posted on 27/2/16 at 06:53 PM |
|
|
Pump should hold the pressure when it stops, 4 bar is way too high for a standard fpr!
If you clamp the hose after the fpr and it drops I would suspect fuel delivery. Any leaks would be detected by your nose..
1972 V8 Jago
1980 Z750
|
|
|
britishtrident
|
| posted on 27/2/16 at 07:02 PM |
|
|
With the pump running engine off clamp off one hose and obsereve the presure drop when you switch off the pump then repeat for the other hose.
Usually with injection systems it is usually a leaking valve in the pump. Leaky pressure regulators usually show as leak diaphragms with fuel leaking
to the vacum side which is fairly obvious as it causes an over rich mixture. Likewise a leaky injector.
[I] What use our work, Bennet, if we cannot care for those we love? .
― From BBC TV/Amazon's Ripper Street.
[/I]
|
|
|
britishtrident
|
| posted on 27/2/16 at 07:11 PM |
|
|
quote:
Originally posted by coozer
Pump should hold the pressure when it stops, 4 bar is way too high for a standard fpr!
If you clamp the hose after the fpr and it drops I would suspect fuel delivery. Any leaks would be detected by your nose..
4 bar is not that excessive with the pump running engine off
[I] What use our work, Bennet, if we cannot care for those we love? .
― From BBC TV/Amazon's Ripper Street.
[/I]
|
|
|
gremlin1234
|
| posted on 27/2/16 at 07:53 PM |
|
|
am I missing something here
but wouldn't you expect the pressure to drop if the pump stops? so ask why is the pump stopping?
|
|
|
Daf
|
| posted on 27/2/16 at 08:22 PM |
|
|
I have tried the clamping hoses without much luck - I think it must be getting past my hose clamp but don't want to make it any tighter as
it's already putting unpleasant dents in the pipes! I think it's dropping slower when the pump side is clamped off indicating a pump
problem.
Can anyone recomend a good inline external fuel pump? The one I have is something like this:
External In-Line Injection Fuel Petrol Diesel Pump Bosch Replacement 0580464070
so anything that be a direct ish replacment would be ideal!
|
|
|
rodgling
|
| posted on 27/2/16 at 09:29 PM |
|
|
If the check valve in the pump has failed, the easy/cheap solution is just to fit an external valve. Sytec do one that will work at 4 bar.
|
|
|
Dusty
|
| posted on 27/2/16 at 10:49 PM |
|
|
The check valve is usually in the output connector of the pump body. Not sure it makes any difference. I've run without one for about five years
and my pressure drops in a second when the pump stops.
|
|
|
