3.0L H6 on E85 = WINNING

[AJ_3RB]

I'm lovin the extra power that Matt just tuned my 3.0R Spec B with E85 (even with fuel average going from 10 to 15 ltr/100 )

...but, has anyone got slightly frustrated with the lack of fuel pressure at start up with the DW65c pump? I don't mean to be too precious about a few extra "ra,ra,ra,ra's" before the engine kicks over, but I would really like to sort it out. Matt said the pump doesn't have an inbuilt check valve (back flow preventer). Has anyone installed a check valve under the bonnet to sort this aspect out?

[alexeiwoody]

I'm lovin the extra power that Matt just tuned my 3.0R Spec B with E85 (even with fuel average going from 10 to 15 ltr/100 )

...but, has anyone got slightly frustrated with the lack of fuel pressure at start up with the DW65c pump? I don't mean to be too precious about a few extra "ra,ra,ra,ra's" before the engine kicks over, but I would really like to sort it out. Matt said the pump doesn't have an inbuilt check valve (back flow preventer). Has anyone installed a check valve under the bonnet to sort this aspect out?

I wonder if it's the pump.

The dw65 properly installed will usually cause easier startup on 98.

If the issue is only on cold starts - then it's the ethanol.

[KiDo_Tuning]

I'm lovin the extra power that Matt just tuned my 3.0R Spec B with E85 (even with fuel average going from 10 to 15 ltr/100 )

...but, has anyone got slightly frustrated with the lack of fuel pressure at start up with the DW65c pump? I don't mean to be too precious about a few extra "ra,ra,ra,ra's" before the engine kicks over, but I would really like to sort it out. Matt said the pump doesn't have an inbuilt check valve (back flow preventer). Has anyone installed a check valve under the bonnet to sort this aspect out?

I wonder if it's the pump.

The dw65 properly installed will usually cause easier startup on 98.

If the issue is only on cold starts - then it's the ethanol.

DW65c fitted to a stock standard car as a 200,000km replacement. Same extra turn over. Revised pump design saw drain back valve issue start

[Out6ack]

Mine does the same since dw65 install. Pisses me off. Is there a fix??

[kiahatsiu]

Are you talking about having to crank your car longer or the fuel pump being noisy?
If cranking, there is little blame you can place on Matt, E85 is just harder to start.

[jaydece]

I'm lovin the extra power that Matt just tuned my 3.0R Spec B with E85 (even with fuel average going from 10 to 15 ltr/100 )

...but, has anyone got slightly frustrated with the lack of fuel pressure at start up with the DW65c pump? I don't mean to be too precious about a few extra "ra,ra,ra,ra's" before the engine kicks over, but I would really like to sort it out. Matt said the pump doesn't have an inbuilt check valve (back flow preventer). Has anyone installed a check valve under the bonnet to sort this aspect out?

how do you know its lack of fuel pressure? have you got a fuel pressure gauge?.... to see if it is the pump? o rings? not sealed or similar related you should be able to turn the key to prime pump on ign ( dont start ) and see if the gauge holds pressure? if it doesnt....then your install on the dw65c isnt right...

[AJ_3RB]

Absolutely no issue with Matt. His tunes are 24 carat coded gold! (and a bloody good bloke to boot).

It's just the DW65c pump that seems to be putting a slight spanner in the works. I figure most of the forced induction Subi's may have installed a fuel regulator (which mostly have back flow prevention inbuilt) with their general set up, so they wouldn't experience the issue so much. Interesting to see if someone has overcome this lack-of-fuel-pressure-at-start-up issue with a check valve (or similar) installed...

[AJ_3RB]

I'm lovin the extra power that Matt just tuned my 3.0R Spec B with E85 (even with fuel average going from 10 to 15 ltr/100 )

...but, has anyone got slightly frustrated with the lack of fuel pressure at start up with the DW65c pump? I don't mean to be too precious about a few extra "ra,ra,ra,ra's" before the engine kicks over, but I would really like to sort it out. Matt said the pump doesn't have an inbuilt check valve (back flow preventer). Has anyone installed a check valve under the bonnet to sort this aspect out?

how do you know its lack of fuel pressure? have you got a fuel pressure gauge?.... to see if it is the pump? o rings? not sealed or similar related you should be able to turn the key to prime pump on ign ( dont start ) and see if the gauge holds pressure? if it doesnt....then your install on the dw65c isnt right...

You are absolutely right re "turning the key to prime" - when I remember to pause to prime, it starts almost straight away. That's how I've been dealing with it for now. But to be honest, I've forgotten to pause to prime too many times and can't stand hearing my pride and joy Spec B sound like a dead Datsun with a blocked carbi.

(NB: My first car was a 180B Datsun and I loved it).

[Out6ack]

Yep, me too Arron. ( the pump, not the Datsun..)

It's a PITA sometimes having to wait for the pump to prime before cranking if you're in a rush. It's only since the dw65c install -never had to do that with the stock pump. Once primed, starts fine. If I don't, it just sits there winding over for ages. Key off, try again, starts straight up -I doubled up on the 'O' rings too..

Interested to see if you can sort out a valve mod mate. Post it up (under a new subject) if you do.
No big deal to prime, but yeah, it'd be good not to have too.

Running 98 thru the colder months. E85 and brass monkey mornings don't mix..


Jay.

[KiDo_Tuning]

Are you talking about having to crank your car longer or the fuel pump being noisy?
If cranking, there is little blame you can place on Matt, E85 is just harder to start.

Stock fuel pump for the guys who have done the whole 5 or 6 tanks on E85have been issue free until pump fitted. Fuel gauge on 2 of them registers total loss of fuel pressure after engine shut off. Got a brand new DW65c pump, fitted it to my old E85 fuel drum gantry I used in my shed for filling cars off a bowser hose instead of siphoning to a 10L jerry etc. Sure enough, total loss of pressure after power drop... essentially anti drain back valve is non-existent. That is why priming the fuel lines works

[KiDo_Tuning]

Anti-Drain Back Valve setup for engine bay:

One of 610-06 http://www.mscn.com.au/speedflow-produc ... heck-valve
One of these 715-06-06: http://www.mscn.com.au/push-on-tails/ef ... -gm-female
One of these 716-06-06: http://www.mscn.com.au/push-on-tails/ef ... rs-gm-male
Two x of these: http://www.mscn.com.au/female-swivel-sp ... 180-degree
Not cheap option but the 2 180 degree swivels keeps the whole setup in a very compact size and is essentially clip in.

[cynner]

How long does one need to prime the fuel system for? I normally do this anyway... (habit I got used to with my old Legacy) - so not really fussed by it. Are there any other drawbacks/risks not having an anti-drain-back setup?

[Out6ack]

Thanks for that Matt.

[alexeiwoody]

Are you talking about having to crank your car longer or the fuel pump being noisy?
If cranking, there is little blame you can place on Matt, E85 is just harder to start.

Stock fuel pump for the guys who have done the whole 5 or 6 tanks on E85have been issue free until pump fitted. Fuel gauge on 2 of them registers total loss of fuel pressure after engine shut off. Got a brand new DW65c pump, fitted it to my old E85 fuel drum gantry I used in my shed for filling cars off a bowser hose instead of siphoning to a 10L jerry etc. Sure enough, total loss of pressure after power drop... essentially anti drain back valve is non-existent. That is why priming the fuel lines works

That's bizzare. Has the dw65 been updated in the last year (got a link? Google says no...)?

On 98 the dw65 was actually supplying more fuel than stock on startup - the thing would start with half a crank.

Never had any issues losing pressure after power off. Priming the pump or not, the cranking still takes the same amount of clicks everytime. If car is warm on e85 - starts as stock on 98.

The Million Dollar Question: Are these issues only during coldstarts or do you need extra turn overs for ignition even after the car is warm (ie operating temp - turn off/turn back on?)

[Out6ack]

Cold, Hot, 85, 98 - all the same. If you don't prime it first, it'll just crank over for ages.