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Fuel route check
L5W - 9/4/11 at 04:07 PM

Hi,

I've been trying to complete the fuel circuit on my indy build today and looking for the best place to mount the regulator and high pressure fuel filter, this is what I've come up with:






Before I start drilling holes in the battery tray to mount the regulator and filter, does the hose, T piece and general positions look ok? Is there a better way of doing this? (Ignore the braided hose as I'll be changing this to non-braided hose with markings for IVA)

Cheers,

Lee

phoenix70 - 9/4/11 at 04:12 PM

I assume your using Fuel Injection?

if so, the fuel pipe from the pump should go directly into the injector rail, and the regulator should be on the return pipe to the tank, that how you maintain pressure in the fuel rail, no T-Pieces are need.

The route should be HP Pump - HP fuel Filter - Fuel Rail - Regulator - Return to tank

Cheers

[Edited on 9/4/11 by phoenix70]

[Edited on 9/4/11 by phoenix70]

Ben_Copeland - 9/4/11 at 05:04 PM

ignore that, i didnt see your return

[Edited on 9/4/11 by Ben_Copeland]

DRC INDY 7 - 9/4/11 at 05:04 PM

quote:
Originally posted by phoenix70
I assume your using Fuel Injection?

if so, the fuel pipe from the pump should go directly into the injector rail, and the regulator should be on the return pipe to the tank, that how you maintain pressure in the fuel rail, no T-Pieces are need.

The route should be HP Pump - HP fuel Filter - Fuel Rail - Regulator - Return to tank

Cheers

[Edited on 9/4/11 by phoenix70]

[Edited on 9/4/11 by phoenix70]




as above but put the fuel filter between the tank and feed into the fuel pump no need for a filter after the pump that way

ed1801 - 9/4/11 at 05:05 PM

Unless you are using a dead headed fuel rail, in which case the above looks correct. Saying that, if you have the connections one with a return prevents bubbles forming when idling in traffic. I switched from your setup to a return one as I was having problems with this.

I might try to stick the filter near the pump at the fuel tank so that there are less connections right above your feet to break and douse them in petrol.

Ben_Copeland - 9/4/11 at 05:30 PM

Where did you get the filter mount and pressure reg?

MikeRJ - 9/4/11 at 06:42 PM

Is that blue plastic T piece suitable for high pressure fuel at typical underbonnet temperatures?

SeaBass - 9/4/11 at 06:47 PM

Yep - ditch that blue plastic thing - it'll only age and fracture. Also what spec is that hose. It looks a bit "classic" to me like they use on VW campers that keep catching fire.

big-vee-twin - 9/4/11 at 07:05 PM

Fuel filter needs to be before the pump to protect it from Crap in the tank

SeaBass - 9/4/11 at 07:28 PM

quote:
Originally posted by big-vee-twin
Fuel filter needs to be before the pump to protect it from Crap in the tank


Most OE installs have a simple strainer pre pump. Injection pumps don't like having resistance on the input.

I wouldn't put anything too restrictive before the pump. The cars I've plumbed haven't used anything pre pump and they've been fine.

L5W - 9/4/11 at 07:28 PM

quote:
Originally posted by Ben_Copeland
Where did you get the filter mount and pressure reg?


Fuel Pressure Regulator with Gauge Universal Fit BLUE | eBay UK

The filter mount is two 50mm Terry clips which I got from ebay

quote:
Originally posted by MikeRJ
Is that blue plastic T piece suitable for high pressure fuel at typical underbonnet temperatures?


I could have sworn this was suitable with fuel but, I've just checked the listing again and no word of fuel resistance is mentioned. Will try and find a suitable alternative. Ta for pointing this out, I wouldn't have checked otherwise,

quote:
Originally posted by big-vee-twin
Fuel filter needs to be before the pump to protect it from Crap in the tank

This is what I have under the tank, a low pressure filter before the pump. I read on here somewhere that putting a second filter after the pump can prevent the injectors getting damaged should the pump start to disintegrate.



cheers

Lee

[Edited on 9/4/11 by L5W]

DRC INDY 7 - 9/4/11 at 07:53 PM

If you use abig fuel filter then you will not get any problems acts like a mini fuel tank plus it will be 12 mm feed in and out as opposed to 8mm

Ben_Copeland - 9/4/11 at 08:08 PM

Does the filter and pump need to be under the tank? looks a little exposed

matt_gsxr - 9/4/11 at 09:16 PM

So, you have:

A filter before the pump (good as long as it isn't restrictive)
A filter after the pump (standard OEM practice)
A dead head fuel supply (not ideal in theory but actually seems to work)

I had dead head and it worked fine, actually it is the standard for those Suzuki TBI's and fuel rail. As we know changing away from dead head is a pain if you want to reuse the stock fuel rail.


As stated by others, not sure about hose, or T-piece (you can get brass T-pieces merlin merlin_T_pieces). You might need a few more clamps, or change the locations of things, to stop the hose waving about.

Seems like a pretty fair set-up to me.



Matt


L5W - 9/4/11 at 11:27 PM

Thanks Matt, it was your reply in one of my previous threads that convinced me to go the dead head fuel rail route, provided I swap out the plastic T piece for a brass version as mentioned. the pics in the first post are just mocks ups to check the route and connections, the hose will be replaced with a non-braided, marked up version hose for IVA using new hose clamps.

Thanks all

Lee

SeaBass - 11/4/11 at 08:26 PM

lol - Spot the numptie who couldn't read your original post - me! Just seen your original comment about the hose spec.

JC