Fuel Surge

[bloosted]

Hi all ever since my t was standard when it had under qtr tank of fuel it would cough and fart I have read bits about it on here but every time I get a bit more power it happens a bit further up in fuel now I have 274rwkw my mods are cai,difillipo dump pipe and cat,valve springs,injectors,ase cooler,centre muff removed now it happens on 1/2 tank or less wot a pain in the rectum will a fuel pump upgrade fix this?or something else any advice would be greatly appreciated aprox cost would be even better,just seems every time someone wants to play I'm under half.

ps does that power sound right with my mods?

[bloosted]

Sorry if this is old ground even a point in right direction would be great

[Benny]

Does your car have the edit? If not then I would suggest to get one and some time on the dyno tuning.

[replicant]

On the race car fuel systems that I worked on, there's usually a priming pump that transfers fuel from the main tank into another chamber that feeds the main fuel pump to the engine. This is to maintain fuel at the main pump and prevent it being starved due to fuel sloshing around in a partially empty tank.

Starvation occurred when:

- Where the main pump serving the injector rail did not have sufficient capacity at 100% duty cycle to maintain fuel pressure

- Under sustained full throttle applications (ie down the back straight of Pukekohe where full throttle is sustained for up to 30 seconds) the main pump would run the primer chamber dry, note this doesn't happen very often and only on certain circuits (and very unlikely on the road)... something that we didn't notice until spending a fortune on upgrading main pumps...

- Partial blockage of fuel filter (that's really annoying)

I don't know what the rated capacity of the fuel pump nor how much fuel you are consuming at maximum throttle at high revs - however given the symptoms you may require a bigger main pump or investigate priming pump if applicable.

[turbotom]

Have you got a ute?

I have had the same issues. Used to be slight pinging just on full throttle gear change.

I added an inline Bosch pump (APS ph3 style) and had the EDIT sort out a few issues... Thought all was good... until I took car out to AIR a month or so ago.

I had deliberately kept fuel level low (less than 1/4 tank)

This time car lost power drastically at about 5000 rpm, and pinged quite bad on a preliminary trial on my private test strip before goingf through the entrance gates.

Wasn't happy. went home without any updated timeslips. Still am suspicious of the BP fuel I put in, as it was when the fiasco with supply was an issue.

The other day, I noticed once again, a slight ping under full throttle, when I was down to less than 40 km to empty.....

Time for a surge tank.

Who's fitted one? What size would you recommend?

I was thinking a 2 litre tank located in the void in front of the rear left wheel.

Plenty of space, close to main tank... should be easy install.

Quite a few installations I've seen are in the engine bay, but I figure with the high under hood temps in the "T" , that increased fuel temp would be detrimental?

Any thoughts from the gurus?

tom

[bloosted]

Yeah have edit mine is a sedan like I said mine did it stock under 1/4 now it does

it 1/2 starting to think any more power will have to keep it full.

hey tom I,m in adelaide to who does your tuning? does aps 3 have upgraded

fuel pump?

[turbotom]

  bloosted said:

Yeah have edit mine is a sedan like I said mine did it stock under 1/4 now it does

it 1/2 starting to think any more power will have to keep it full.

hey tom I,m in adelaide to who does your tuning? does aps 3 have upgraded

fuel pump?

APS PH3 includes the fuel pump.

My advice though, is to fit an updated intank pump, which has higher flow rate and is quieter. My Bosch pump is a bit noisy.

Have a read through some of the threads on fuel surge or intank fuel pump...

(do a search for wallbro fuel pump) and consider some of the suggestions.

One of the suspected reasons for fuel supply issues is a relief valve on the intank swirl pot. I think there is some info on how to check for a weak (lo pressure) relief valve which may cause these issues.

As I said, I'm going to fit a surge tank, as it will definitely eliminate any fuel supply issues. As I already have an auxilliary external pump, its not an expensive exercise. An alloy surge tank shouldn't cost more than $100.... seen some on Ebay $60~$80...

As far as tuners go....

APS in Melbourne for original Ph2 install (274 rwkw)

Morpowa in Adelaide for APS IC upgrade and retune of unichip (good results 308 rwkw)

and HPF in Melbourne for EDIT tunes ( 3 maps) (valet / road 260 rwkw /race >300 rwkw)

Might want to consider Street_tuner in Adelaide too..... His new workshop should be complete by now..... at Gillman. He's got most knowledge of EDIT functionality.

A few other SA boys have used KPM ....

[Morpowa are also APS agents whereas KPM are Nizpro]

Not sure of others.

tom

[Xtreme F6]

couple of things to check, firstly, my F6 had the pipes on the wrong way and when it got to quater it would just die till u lifted the foot off the throttle, the return was plugged into the breather and the breather was plumbed into the return lol put them back and it was fixed, but at around 20 kms to empty it would do it, fitted a walbro and that fixed that.