pekwah1
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| posted on 6/5/25 at 06:08 AM |
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Checking fuel pressure
Hi guys,
Having recently taken delivery of my striker, I just have one main issue to fix.
On higher RPM the car stutters and feels like a fuelling issue.
Engine is a 2.0 blacktop zetec on standard ECU.
I have a low pressure pump gravity feed from the tank, which feeds a swirl pot, and then goes to a high pressure pump, which then feeds into the
factory fuel rail.
How would you go about testing the fuel?
My current thoughts:
1. Take the hose off from the HP pump and time it into a container to get the flow rate
2. Buy a fuel pressure gauge and connect that in after the HP pump
Thanks
Andy
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JAG
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| posted on 6/5/25 at 06:58 AM |
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I don't think you need to measure fuel pressure - and it will be very diffcult and expensive to measure fuel pressure at maximum RPM with the
engine under load.
You'd need to have a pressure sensor that can log readings while the car is being used OR you would need to put the car on a rolling road. Both
do-able but costly.
I'd start by calculating the fuel flow rate needed by your engine at maximum RPM.
Then I'd measure the fuel flow rate of the set up you have. Both high and low pressure pumps need to flow enough fuel. The method you mention
should be OK.
If the flow rate of the high and low pressure pumps is less than your engine needs at maximum RPM then you'll have a fuel pressure issue.
Justin
Who is this super hero? Sarge? ...No.
Rosemary, the telephone operator? ...No.
Penry, the mild-mannered janitor? ...Could be!
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JAG
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| posted on 6/5/25 at 09:58 AM |
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There are on-line calculators to tell you how much fuel your engine will consume....
Raceworks.com.au
OR
deatschwerks.com
Justin
Who is this super hero? Sarge? ...No.
Rosemary, the telephone operator? ...No.
Penry, the mild-mannered janitor? ...Could be!
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pekwah1
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| posted on 6/5/25 at 10:01 AM |
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Thanks Justin,
I’ll see what kind of flow I’m getting, I have got a fuel pressure tester to use as well, I know I can’t really use it under loads but might give me
some idea…
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coyoteboy
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| posted on 6/5/25 at 11:53 AM |
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Not got a wideband on it?
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pekwah1
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| posted on 6/5/25 at 05:41 PM |
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No wideband….
Think I’ve found the issue(s) though… mixture of blocked filters and badly placed pumps / fuel hoses…
Systematically going through and sorting and hopefully as simple as that
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bi22le
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| posted on 12/5/25 at 07:53 PM |
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quote:
Originally posted by pekwah1
No wideband….
Think I’ve found the issue(s) though… mixture of blocked filters and badly placed pumps / fuel hoses…
Systematically going through and sorting and hopefully as simple as that
Standard 2nd hand kit car job. I had to do the same. Good practice to change the fuel filter, its often forgotten. I was well chuffed when I dug out
my filter and HP pump to find out they were both decent Sytec ones. Meant I didnt have to fork out for new ones.
Glad to hear you are back on the scene with a striker. Fancy a track day!!?
Track days ARE the best thing since sliced bread, until I get a supercharger that is!
Please read my ring story:
http://www.locostbuilders.co.uk/forum/13/viewthread.php?tid=139152&page=1
Me doing a sub 56sec lap around Brands Indy. I need a geo set up! http://www.youtube.com/watch?v=EHksfvIGB3I
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pekwah1
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| posted on 12/5/25 at 08:37 PM |
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Actually no I was wrong, still got the problem.
So far have changed sparks, leads and coil.
Flushed all fuel lines, tested HP pressure, cleaned injectors.
Removed intake manifold and remounted with new gasket.
Still sounds like it’s firing on 3 cyls when under load, I have no idea what the problem is.
ECU doesn’t give any error codes
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coyoteboy
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| posted on 13/5/25 at 01:27 PM |
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Checked the TPS output (at the ECU input pins)?
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pekwah1
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| posted on 13/5/25 at 04:13 PM |
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I haven’t but will check that out thanks
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