Fox Xtremely high fuel consumption

[LILCBRA]

Well I haven’t found that evidence yet.
About your last paragraph if I’m wasting over 50% of the fuel we are talking more than 7 gallons of fuel… I haven’t inspected both fuel lines from the engine to the tank it would be evident to see 7 gallons leak but in good fate I will lift the car to go underneath and will closely inspect all the fuel lines, I promise that

The fuel lost per mile would only be maybe .05 gallons, or .2 liters per mile. Seems like a small drip somewhere that could be exacerbated by increased flow when cruising might be a likely culprit. Has the fuel tank been dropped recently? I'm wondering if it's leaking at the lines coming from the pump, like maybe a bad O ring or something. I think it would be possible to not notice a leak back there if it's not dripping to the ground, though I'd think you'd be able to smell it. I suppose it depends on where it could be leaking - it might be leaking on something and evaporating/burning off before it hits the ground or creates an amount large enough to notice. This is all a spit ball of course, but it does seem logical....

 

[86HO5.0]

Keep an eye on the ground strap, it looks like you're running too much timing. You want the color change to be in the middle of the bend.

Timing isn't causing the fuel consumption issue, just something I noted.

Have you bought a Wideband yet?

 

[PonyGTrider]

Run those new set of plugs for a tank of gas and do your usual calculation to see where you're at.

You'll get a better read on the plugs too.


Wow... The length comparison in your image makes them look really long.

I can do that,
At first I was very concerned about the plugs coming in contact with the pistons but I measured that gap and relaxed then since there was over 0.200” of clearance

 

[PonyGTrider]

The fuel lost per mile would only be maybe .05 gallons, or .2 liters per mile. Seems like a small drip somewhere that could be exacerbated by increased flow when cruising might be a likely culprit. Has the fuel tank been dropped recently? I'm wondering if it's leaking at the lines coming from the pump, like maybe a bad O ring or something. I think it would be possible to not notice a leak back there if it's not dripping to the ground, though I'd think you'd be able to smell it. I suppose it depends on where it could be leaking - it might be leaking on something and evaporating/burning off before it hits the ground or creates an amount large enough to notice. This is all a spit ball of course, but it does seem logical....

Yeah I know what your saying and I will do what you suggested

 

[PonyGTrider]

HERE IS AN UPDATE:
Ok guys here brand new NGK FR5-1 sparkplugs calibrated to 0.054” with about 8 miles with few springs at WOT with 84 octane gasoline 19lb injectors, 210lph fuel pump, fuel pressure at 39psi with vacuum hose connected, and 14 degrees BTDC of advance.
Let me know what do guys notice as far as air/fuel mixture? NORMAL, RICH, or LEAN condition? Any indication of over fueling as to cause a pathetic 9.5 miles per gallon???

Please I’ll read all your comments

 

[PonyGTrider]

Keep an eye on the ground strap, it looks like you're running too much timing. You want the color change to be in the middle of the bend.

Timing isn't causing the fuel consumption issue, just something I noted.

Have you bought a Wideband yet?

No wide band yet,
Oh ok so I could go to the base 10 deg

 

[PonyGTrider]

The fuel lost per mile would only be maybe .05 gallons, or .2 liters per mile. Seems like a small drip somewhere that could be exacerbated by increased flow when cruising might be a likely culprit. Has the fuel tank been dropped recently? I'm wondering if it's leaking at the lines coming from the pump, like maybe a bad O ring or something. I think it would be possible to not notice a leak back there if it's not dripping to the ground, though I'd think you'd be able to smell it. I suppose it depends on where it could be leaking - it might be leaking on something and evaporating/burning off before it hits the ground or creates an amount large enough to notice. This is all a spit ball of course, but it does seem logical....

You’re right I haven’t inspect the lines inch by inch and I’ll do that,
Thank you

 

[General karthief]

This engine does not have a lot of miles on it right?
Has it ever been on a good two or three day bender where it's been driven for several hours like on a trip or has it been a short trips across town?

 

[PonyGTrider]

This engine does not have a lot of miles on it right?
Has it ever been on a good two or three day bender where it's been driven for several hours like on a trip or has it been a short trips across town?

That’s correct 70m at the most.
I had a long trip of 2,200 miles and a couple of about 800 miles, and then some about 300 miles and city drive

 

[Trogdor]

This is something out of left field.

Disconnect the fuel rail in the engine compartment and pressurize the injector side. Set your air compressor to 40 psi. Any leaks?

 

[nicholase]

stock regulator with no leaks and pressure at 39lb vacuum on,

fuel pressure at 39psi with vacuum hose connected,

Fuel pressure should be set at 39 psi with the vacuum line disconnected and plugged. It should read lower with the vacuum line on.

 

[86HO5.0]

No wide band yet,
Oh ok so I could go to the base 10 deg

Get a wideband, otherwise it appears we are pissing into the wind.

 

[86HO5.0]

Pull 2 degrees of timing for now and check the ground strap after driving for awhile.

 

[General karthief]

Get a wideband, otherwise it appears we are pissing into the wind.

You're not supposed to be watch'n people pee.....I keep my back to the breeze but I have pee'd on my shoe once
Yeah, important info right there.

 

[PonyGTrider]

Fuel pressure should be set at 39 psi with the vacuum line disconnected and plugged. It should read lower with the vacuum line on.

That would be with a stock engine and stock cam wouldn’t it?
Fuel pressure in my engine runs at 40+ with vacuum off and with my stage 1 cam only drops to ~39 with vacuum line connected.
Am I doing this thing wrong???? What do I supposed to have my pressure set with my set up???? All my specs are in my signature or profile

 

[PonyGTrider]

Pull 2 degrees of timing for now and check the ground strap after driving for awhile.

I’ll do that once I get home

 

[PonyGTrider]

Get a wideband, otherwise it appears we are pissing into the wind.

That will be the best, I’ll try to get one

 

[86HO5.0]

I've got a POS Innovate in my Mustang, never again.

Running an AEM in the Volverine and love it. Highly recommend the AEM.

 

[PonyGTrider]

I've got a POS Innovate in my Mustang, never again.

Running an AEM in the Volverine and love it. Highly recommend the AEM.

I’ll consider your suggestion
Thanks man

 

[gkomo]

Did you say you are running 84 octane gas?