2013 auto, supercharged, stage 1 cam, ID1050x injectors running E85 with aux pump. OEM fuel pump died and was replaced by racetronix e85 450 pump by one shop. Long start issues due to zero fuel pressure. 2nd shop replaced crossover tube, orings and line into tank. Now holds pressure to 40 psi but sometimes still long start (7 seconds). They added fuel check valve to fuel line at engine but still sometimes long start. On the dyno the pump performed perfectly at WOT. They did remove a boost a pump that was on there because they said it wasn't needed anymore.

Racetronix is saying as long as there is pressure in the lines before it cranks it is not the pump. The issue is I can't see the fuel pressure.

My questions are:

Have you seen racetronix fuel pumps with intermittent problems before? Is this the likely issue?

How could I install a fuel gauge so that I can monitor the fuel line pressure before and during start? I own the dashlogix ODB module but that doesn't boot up until ignition is on and pump primes. Can I run an actual gauge to the dash via a sensor? If so can you link the correct parts? There is a test port on the Magnusson rail.

Could it be a faulty injector or something else? How to diagnose?

Could it be that this has always been an issue since the supercharger build and was hidden by the boost a pump but now exposed by the BAP removal? (Build shop installed the BAP when I had it supercharged. Then I went flex and they installed an aux pump in tank but did not uninstall the BAP, until just now)

So far I've spent $3500 on this and very frustrated so any help would be greatly appreciated.

Thanks Andy.

 

If you can hook up a mechanical fuel pressure gauge I’d see if the fuel pressure holds on shutdown…also a faulty cam sensor can cause long crank times…good luck !!

 

Would a faulty cam sensor be intermittent? Most of the time it starts within a reasonable amount of crank.

Today under the hood I smelled gas after I ran it and shut it off. I found that there was a small amount of gas oozing from the new check valve plumbing the second shop installed on the rails, I'm thinking if gas can drip out perhaps air can get in and reduce the fuel pressure?

 

It can be !!…this can also be a crank sensor issue. I’d get that fuel leak taken care of. Without a lab scope to check both the cam and crank sensor you’re only guessing !!