Still chasing fueling stuff... we are modding a previously modded system and are having headaches. Todd says its something hardware, now we are just trying to find out WHAT!?

so a blown turbo leads to bigger turbos, needing more fueling. So we add an inline pump from Proto, 80#, and back to stock bored out FPR. The car has aftermarket fuel lines and filter (pictured). Since we dont have the stock filter, we cannot check fuel pressure as you would a stock setup. This used to be part of the old evoms GT700 fueling setup.

initial A3076 logs showed car running pig rich everywhere. 70+ psi checked from plummed in tee after 2nd pump(higher psi than todd wants or tuned for)

Anyway... we opened up the fuel reservoir and cycled the pumps via durametric. It seems that the RETURN is giving us minimal, sputtering flow. Not what I would call a stream tho. We are on our 2nd FPR, just in case it was that. All injectors are new. 2nd fuel pump is new. lines, stock pump, and fuel filter are as they have been.

What could be our return issue, that is causing high pressures back in the system, and resulting in sputtering return flow?
Could fuel filter (pictured) be the issue somehow? the in-tank pump maybe? I am about ready to scrap the damn thing. Serious.

 

I am very doubtful that the filter is causing your issue - as that is before the injectors and could only decrease fuel pressure not increase.


Its not clear in your pictures where you put the second pump, however, the manual has specifics on how to test the fuel pump for pressure and flow. For flow, with the engine off, and fuel pump on test the flow in the return line should fill a half gallon container pretty quickly (the manual says how quick).


I would then start to check your return line. Does your car use the original fuel cooler. You can disconnect their and test. This cuts out the line back to the tank. If it is flowing there you know its after that.

 

On my setup, when we had the OEM cooler still hooked up, the fuel pressure would sky rocket. Eliminating the cooler did the trick.

On the other hand I have seen Todd use the OEM cooler properly by splitting the return line after the fpr. Essentially having two return lines (OEM and your own).

 

I am pretty sure it is the stock fuel cooler. Looks like it anyway. That's a good heads up. Thanks

The pump is an under-car setup. We will check to see how much flow it should put out.

 

no disrespect as i know you didnt set it up but that setup looks like garbage.The union,the way it is ran the clamps at the swell pot all looks hastily done which is why your probably having problems.

 

That setup looks extremely dangerous!

 

My understanding is this originally had the Evoms gt700 fueling.
What need to be done to rectify this? And what makes it "dangerous"?!

If this could be the cause if my issue, I need to fix it... NOW!

 

In my opinion what does make it dangerous is the transition on the return line has a union for no obvious reason other than the fact the original line was cut to short. This could possibly be from the initial fuel system install. This being a fitting that does not need to be there and could start leaking in the future. If it worked before than that's fine. Though I've never seen a EVOMS setup on the 700 car that was done by Sharkworks/EVOMS/Imagine Auto/etc. that was setup like that.

What FPR did you have in before the 80# injectors/2nd pump? Factory or a 5bar?

 

that is not an Evoms fuel system of any kind......this i am sure of.

 

if car is rnning very rich check for njectors stuck open. get rid of your fuel cooler , its very restrictive. i would not worry about union fittings, not the cleanest way but if you assembled them correctly they should not leak. i do not like all the 90s you are using for no reason, not good for flow. you can make this setup way cleaner by routing the lines over the back of the tank and into the driveshaft tunnel if you are RWD, you can also put the filter down there too.

 

I am not a fan of the hose clamps on top of the tank, these lines were designed for an an-fittings. It can work but I would feel much safer with an an-bulkhead out of the top. I also would replace the filter cartridge for safe measure, but I am thinking the issue is your bored out FPR, I would replace it with a stock unit since you have aftermarket injectors.

 

Before this setup, I had stock FPR with 60# injectors.

We ran this setup on that FPR. Then, purchased a new OEM fpr. THEN, bored out that FPR per Todd's suggestion. Same issue.

I know nothing about fuel lines or connections or unions... But If we have unnecessary bends, I don't like that.
Also, how can we "eliminate" the fuel cooler completely? What doe we clamp or remove? Is it a straight forward removal? I don't want to be spraying fuel or coolant all over the back of my car!