Swoakes SS1 DET Sprint Car plan for 2019 on

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swoakes
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Post by swoakes » Sun May 27, 2018 11:43 am

The fuel supply failed again at Prescott yesterday. Thankfully only on Josh's return down the hill after his T1 run so he simply swapped to the temporary supply I wired in the other day and the car was running again.

So it looks like the ECU is intermittently dropping its fuel pump earth supply. All wiring is new, new earths, new pump and new relay so I can think what else it could be :?

I have a spare ECU now so I need to get a socket soldered to the board and swap the chip over from the old ECU.


Steve Oakes
SS1 DET Sprint Car

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SS1 DET Turbo sprint Project
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Post by Corky » Tue May 29, 2018 3:48 pm

Isn’t it just a resistor swap on the board to fix it. Might be easier to fix the board on the one you’ve got, rather than solder in a socket on the spare ECU.


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Post by swoakes » Tue May 29, 2018 3:56 pm

Corky wrote:
Tue May 29, 2018 3:48 pm
Isn’t it just a resistor swap on the board to fix it. Might be easier to fix the board on the one you’ve got, rather than solder in a socket on the spare ECU.
Just been over to see Jamie at Revlimit about this. He is going to solder a socket on the ECU received from Ben and on my spare which I forgot he had :oops: ( explains why it wasn't in my spares box :) )

I'll ask him about the resistor Steve :wink:


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SS1 DET Sprint Car

Former cars
SS1 DET Turbo sprint Project
Sabre Ti
SS1 Ti
1971 Yellow 5a
1985 SS1 1600
1978 Green/Silver 6a

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Post by Corky » Tue May 29, 2018 3:58 pm

Jamie is the man for the job !


Steve
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Post by swoakes » Sun Jun 03, 2018 9:25 pm

A few more car issues today at Harewood.

The car ran without fault but we appear to have pressurisation of the fuel system occurring.

When I went to re-fuel petrol was forced out of the filler cap when I removed it; a lot of fuel :shock:

WE checked the breather which seemed ok. Cap is unvented (always has been) and apart from the pump change at Ty Croes nothing has changed.

The pump we fitted is an Ebay special HP pump currently in use on 2 other ET's without issue.

On thing of note is how erratic the fuel pressure gauge is at the moment. (take a look at my video in the Harewood thread (RH gause on top of dash is fuel pressure)

Bit of a strange one; when I ran the car with the fuel cap off; fuel was forced out of the filler aperture :shock:

Thoughts?
Last edited by swoakes on Sun Jun 03, 2018 9:44 pm, edited 2 times in total.


Steve Oakes
SS1 DET Sprint Car

Former cars
SS1 DET Turbo sprint Project
Sabre Ti
SS1 Ti
1971 Yellow 5a
1985 SS1 1600
1978 Green/Silver 6a

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Post by efi_sprintgte » Sun Jun 03, 2018 9:36 pm

Pump running backwards?

Return line and input line mixed up?

I’m sure that’s not the case but back to basics first I guess..


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Post by swoakes » Sun Jun 03, 2018 9:44 pm

efi_sprintgte wrote:
Sun Jun 03, 2018 9:36 pm
Pump running backwards?

Return line and input line mixed up?

I’m sure that’s not the case but back to basics first I guess..
Josh connected the pump at Ty Croes; would the car run for 3 events with the input/ output swapped :?:

I'm pretty certain the pump is running the correct way electrically because in sorting out the wiring I did have it running backwards for a while. I couldn't understand why I was getting no fuel pressure when the pump was running. If you look further up the thread you will see that wiring colours swapped over through an existing connector.


Steve Oakes
SS1 DET Sprint Car

Former cars
SS1 DET Turbo sprint Project
Sabre Ti
SS1 Ti
1971 Yellow 5a
1985 SS1 1600
1978 Green/Silver 6a

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Post by gtcse8 » Sun Jun 03, 2018 10:13 pm

Just my Tuppence worth.

Is the tank overfill/recirculate pipe correctly routed?.
Its the one that fits onto the small pipe fastened about half way down the Main Steel filler pipe, just under the fuel cap.

On my way home after Harewood the SST went into limp mode and I thought it was a reoccurrence of when the main ECU plug came loose, I could smell petrol too plus the gauge all of a sudden showed empty so I pulled into the first garage and when I opened the cap there was a pressurisation that actually pushed the cap off the filler neck, started the car and it was still running rough when revved with a smell of fuel so thinking I had a fuel leak I Lifted the bonnet to check there was no fuel spraying around but saw nothing, did the usual wiggle of the wires etc and then saw the fault, number three plug lead had fallen off at the cap.
Don`t know how, popped it back on and full power, whoopee.
Did a bit of menkal arithimatik and realised I still had quarter of a tank, so put cap back on and drove home, never missed a beat, got home and undid the filler cap and it pushed against my hand again.
The TI fuel pump must produce a large amount of pressurisation


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Post by td99 » Mon Jun 04, 2018 6:18 am

Is an aftermarket non-return valve fitted to the tank breather pipe?
I think the original one does allow excess air/vapour pressureto creep out of tank, just not liquid flow or a great rate of air flow.
Pressure build-up due to increased temperature could cause the problem if tank breather not working.


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Post by swoakes » Mon Jun 04, 2018 8:31 am

td99 wrote:
Mon Jun 04, 2018 6:18 am
Is an aftermarket non-return valve fitted to the tank breather pipe?
I think the original one does allow excess air/vapour pressureto creep out of tank, just not liquid flow or a great rate of air flow.
Pressure build-up due to increased temperature could cause the problem if tank breather not working.
Yes aftermarket breather fitted to non standard tank and yes it was warm yesterday.

Fuel coming out of the filler aperture with cap off and pump running suggests more than just a blocked breather though :?:


Steve Oakes
SS1 DET Sprint Car

Former cars
SS1 DET Turbo sprint Project
Sabre Ti
SS1 Ti
1971 Yellow 5a
1985 SS1 1600
1978 Green/Silver 6a

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Post by scimjim » Mon Jun 04, 2018 8:42 am

And the breather wasn’t fitted at that time?

As I said yesterday, the only thing I can think of is the fuel pump is overpressurising and the regulator is diverting a huge amount of fuel to flow back to the tank?


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Post by swoakes » Mon Jun 04, 2018 9:55 am

scimjim wrote:
Mon Jun 04, 2018 8:42 am
And the breather wasn’t fitted at that time?
Not sure Jim
scimjim wrote:
Mon Jun 04, 2018 8:42 am
As I said yesterday, the only thing I can think of is the fuel pump is overpressurising and the regulator is diverting a huge amount of fuel to flow back to the tank?
But as Peter said it can only divert what fuel is physically left in the tank at that time (half full from memory = 10L) Still seems strange that it was forced out of the filler :?

I'll start it up soon and see what happens :)


Steve Oakes
SS1 DET Sprint Car

Former cars
SS1 DET Turbo sprint Project
Sabre Ti
SS1 Ti
1971 Yellow 5a
1985 SS1 1600
1978 Green/Silver 6a

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Post by philhoward » Mon Jun 04, 2018 10:26 am

Was the tank warm (hot) to the touch? Unless you’ve made some magic petrol-producing machine, then it can only be air/vapour buildup which may only be able to escape when the pressure is released.

Maybe 10l of fuel gets rather warm - especially when it’s high ambient temperatures and pumped round the system several times.


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Post by swoakes » Mon Jun 04, 2018 11:52 am

OK started the car this morning and gauge was showing zero fuel pressure then it kicked into life and flicked up and down when revved on throttle. Also cuts to zero, warning light flashes and blue back display cuts. I'm pretty sure the gauge or its sender are faulty. (video below)

I then left ignition on and pump running (ECU bypassed) and with the fuel filler cap off you could hear a slow trickle of fuel returning to the tank. Certainly not a gush; a bit like the sound of a old style toilet cistern dripping badly :)

I ran the car till the fan cut in, switched off and removed cap; no pressure build up at all.

Its cloudy here at the moment at 21.5 degrees not unlike yesterday but the car obviously hasn't been thrashed up the hill.

I had plans to move the fuel regulator anyway so I think I'll buy a new one with matching bracket and move it to the inner wing. I'll also buy a new gauge and sender as the gauge I fitted is pretty cheap and cheerful TBH


Steve Oakes
SS1 DET Sprint Car

Former cars
SS1 DET Turbo sprint Project
Sabre Ti
SS1 Ti
1971 Yellow 5a
1985 SS1 1600
1978 Green/Silver 6a

Image
"Fail to prepare and you are preparing to fail."
Benjamin Franklin

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swoakes
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Post by swoakes » Mon Jun 04, 2018 11:57 am



Steve Oakes
SS1 DET Sprint Car

Former cars
SS1 DET Turbo sprint Project
Sabre Ti
SS1 Ti
1971 Yellow 5a
1985 SS1 1600
1978 Green/Silver 6a

Image
"Fail to prepare and you are preparing to fail."
Benjamin Franklin

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