Omega Owners Forum
Chat Area => General Car Chat => Topic started by: Webby the Bear on 16 September 2014, 11:48:41
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Hi guys,
As above. Am in the market for one that specifically will fit on the schrader valve on the inlets so i can measure fuel pressure. Can anyone recommend a good kit at a reasonable price?
As an aside, has anyone got the spec for fuel pressure for the 2.5 mig? Think its at idle and 3k rpm.... or thereabouts :)
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Oh lordy, it's gonna be a long week ;D
It be stamped on the body of the fuel pressure regulator ::)
Does exactly what it says on the tin... Hence the name :y
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Oh lordy, it's gonna be a long week ;D
It be stamped on the body of the fuel pressure regulator ::)
Does exactly what it says on the tin... Hence the name :y
You love my questions Al! i'm just inquisitive thats all ;)
The spec pressures are stamped on the FPR? Hmmm, never noticed that :-\
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Yes, on the fuel pressure regulator, 3.0 bar for 2.5/3.0 and 3.7 bar for 2.6/3.2.
In theory the pressure varies slightly with engine load (buts its very little)
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Thanks Mark.
To test the regulator am i right in thinking that i pull the vacuum pipe off with car running at idle and the psi should jump up by about 10? thus confirms diaphrams working
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Nope.....and 10 what....if its Bar than that massive!? :y ;)
In the case of modern setups, the pressure variation is jack all with the 'vac' connection being little more than a clean air supply close to atmospheric as the reference.
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Nope.....and 10 what....if its Bar than that massive!? :y ;)
In the case of modern setups, the pressure variation is jack all with the 'vac' connection being little more than a clean air supply close to atmospheric as the reference.
;D no, i did say psi ;)
ok thanks. is there a way to check the operation of the regulator then?
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Nope.....and 10 what....if its Bar than that massive!? :y ;)
In the case of modern setups, the pressure variation is jack all with the 'vac' connection being little more than a clean air supply close to atmospheric as the reference.
;D no, i did say psi ;)
ok thanks. is there a way to check the operation of the regulator then?
Yup... if it sticks shut, the engine floods and won't start when hot.
If it sticks open then it will struggle at higher revs, would probably idle ok as the fuel pump runs at about 6 bar iirc :-\
They're pretty bombproof though :y
Incidentally, if it's a bit weak it will lose pressure over time...
Could use one of Theses (http://sealey.co.uk/PLPageBuilder.asp?id=20&method=mViewProduct&productid=12809) for basic checking :-\
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Nope.....and 10 what....if its Bar than that massive!? :y ;)
In the case of modern setups, the pressure variation is jack all with the 'vac' connection being little more than a clean air supply close to atmospheric as the reference.
;D no, i did say psi ;)
ok thanks. is there a way to check the operation of the regulator then?
Yup... if it sticks shut, the engine floods and won't start when hot.
If it sticks open then it will struggle at higher revs, would probably idle ok as the fuel pump runs at about 6 bar iirc :-\
They're pretty bombproof though :y
Incidentally, if it's a bit weak it will lose pressure over time...
Could use one of Theses (http://sealey.co.uk/PLPageBuilder.asp?id=20&method=mViewProduct&productid=12809) for basic checking :-\
Thanks Al,
When you say a stuck open FPR would struggle at higher revs...... do you mean this could be a reason for my car's lack of power from flooring it? (Trying to cover all bases as well as checking the multirams in the thread in gen. help) :y
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The fuel pump delivers fuel at a constant pressure. If the fpr is weak or sticking open, then it will let more fuel back to the tank meaning less fuel for the injectors... Then when you floor it the ecu opens the injectors for the maximum duration and the fuel rail drains causing starvation. Lift off and the ecu will close the injectors, allowing fuel pressure to build again.
The design pressure of the system is set so that at constant WOT the fuel pump delivers more fuel than the injectors can use, the fpr then acts as an overflow by returning this excess to the tank.
Your issue could be in one of three places...
1. Partially blocked fuel filter.
2. Weak or failing fuel pump.
3. Weak or sticking fpr.
Start with the filter, then the fpr and finally the pump. :y
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Thanks mate, exactly what I thought! cheers for confirming! :y
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Going back to your original question, Sealey's VSE211 is currently on promotion for about £70 and will do what you needd. I've been tempted by one for a while.
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Thanks Nick! :y :y :y
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Nope.....and 10 what....if its Bar than that massive!? :y ;)
In the case of modern setups, the pressure variation is jack all with the 'vac' connection being little more than a clean air supply close to atmospheric as the reference.
;D no, i did say psi ;)
ok thanks. is there a way to check the operation of the regulator then?
Yup... if it sticks shut, the engine floods and won't start when hot.
If it sticks open then it will struggle at higher revs, would probably idle ok as the fuel pump runs at about 6 bar iirc :-\
They're pretty bombproof though :y
Incidentally, if it's a bit weak it will lose pressure over time...
Could use one of Theses (http://sealey.co.uk/PLPageBuilder.asp?id=20&method=mViewProduct&productid=12809) for basic checking :-\
Are they really??...they are not the same that are fitted to the Vectra then as they are horses kack
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Well given that the 2.2 petrol in the Vectra C is a dog of an engine, I should hope not too, especially given the totally different fuelling arrangement ::)
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engines not too bad if fed on super unleaded and serviced every 10,000 miles...20,000 miles between oil change way too far imo
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So, thinking out loud again ::)
Should I only be concerned of a failed / failing FPR if I get some dodgy pressure test results? Or is there a specific test for the FPR?
Sorry if ive missed it where someone confimed
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Due to budget I ended up purchasing this kit....
http://www.ebay.co.uk/itm/Fuel-injection-pressure-test-kit-for-schrader-test-fuel-ports-by-BERGEN-AT271-/141238161649?ssPageName=ADME:L:OU:GB:3160
Does what it says on the tin.
I tested the Omega.... bang on 45psi (around 3 bar) at idle. Gave it a few revs and it just stayed there. Also after switching car off I checked and the pressure went down to about 42. But importantly it stayed there meaning my pressures being maintained
... didn't really know what other tests to do?
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Do you know, in all my days I have never had cause to need a fuel pressure test kit :y
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;D
Fair enough mate. I think it'll be pretty useful more for ruling problems out rather than finding a bad part. Although having said that it may just sit in the garage like my compression set. Either way... got it if I need it :y