2007 fuel pump

[Rudevette]

Hello all,
I am starting to think I have the dreaded c6 fuel pump crack. I have long cranks at start and smell gas. I’ll be doing a fuel system leak down test later today.

Anyway, if I’m replacing the fuel pump do you have any suggestions on something better to replace it with? I have the stock pump with magnavolt right now. Is the Kenne Bell boost a pump and lingenfelter replacement fuel pump a good plan? Or something else? The new boost a pump has a transducer for boost pressure measurements I believe…. Does that fit in the same location as the boost reference tube on the car now?

Any important insight for me?

Thanks,
Justin

[SurfnSun]

Callaway has a stock pump for sale on eBay right now. Username: fastervettes

[Rudevette]

I checked that pump out. That’s a stock Chevy take out pump. I’m hoping to avoid the stock pumps due to the high failure rate on the plastic elbow. I’m also looking at dealing with the magnavolt fuel controller due to the fact that it appears as though it will fail at some point in time.

-Justin

[SurfnSun]

I think you can sub in a Z06 pump and eliminate the boostapump. 89x2 can verify

[BIGJOHN]

What is the fuel pressure?

[*89x2*]

I think you can sub in a Z06 pump and eliminate the boostapump. 89x2 can verify

On the SC560/SC580 cars, I believe the spec for most, if not all, was a stock pump + Magnavolt.

On the SC606, it was the Z06 Pump + Magnavolt

On the SC620/SC652 cars, it was a specially built Callaway pump, no boost-a-pump

[Rudevette]

I finally got caught up with work and am working on the Callaway today. Here is a video of my fuel pressure testing. If anybody has any insight I would appreciate hearing it.

https://youtu.be/WFf3lo1HEFk

Thanks,
Justin

[Rudevette]

On the Corvetteforum it was suggested that the fuel pump prime delay or minimum fuel pressure before crank may be set incorrectly in my tune. Does anybody think that’s a possibility? It would be the time that Callaway put in the car.

The way the pressure drops instantly to zero upon shutdown makes me think it’s an issue in the pump.

-Justin

[*89x2*]

On the Corvetteforum it was suggested that the fuel pump prime delay or minimum fuel pressure before crank may be set incorrectly in my tune. Does anybody think that’s a possibility? It would be the time that Callaway put in the car.

The way the pressure drops instantly to zero upon shutdown makes me think it’s an issue in the pump.

-Justin

It's not the calibration. No way, not unless something was changed. Now something mechanical, I'd go with that.

I'd call and ask Scott @ Callaway on how to bypass the magna volt to verify pressure drop is due to that - I had something similar with fuel pressure loss on the SC580 and proved it with a paperclip.

[Rudevette]

I spoke with Scott at Callaway and he is helping me out. Here is another twist on this situation:

The receipts for all of the work done on the car came with it. The original owner (possibly the second owner...I'm not quite sure yet) still had the car on March 17 of 2017. It went to Dimmitt Chevrolet in Florida and states on the work order-
D C/S HE HAS A STRONG FUEL ODOR SMELL
CAUSE: SPECIAL POLICY
9900358 Evaporative Emissions Smoke and Flow Testing

At that time they replaced the fuel pump, an exhaust gasket and clamp, a lower control arm suspension nut, the fuel lines from the pump to the crossover tube in the drivers side tank, and the o-rings on the crossover tube.

The car has about 30,000 miles on it now. I can check the exact mileage when I get back to my shop later today. It should be noted that it still has a strong fuel odor, particularly after filling with gas. So it's quite a mystery.

-Justin