After HPFP Install, Engine Cranking, Not Starting

[smadasam]

After I replaced my motor like a month ago, my E90 ran fine for about a week or two; then, on the freeway, power starting to cut out until it completely died.

The codes I read at the time were: 2BE9, 2BDE, and 2BF0, which are related to low pressure in the high pressure fuel system. I figured the high pressure fuel pump had failed, so I ordered a new HPFP, gaskets, and sensor and installed them.

After installing everything, the motor cranks, but it is not starting. I am new to BMWs but, generally that means either you don't have fuel or spark. There wasn't any codes at this point.

Other thing of note, I installed the Radium Engineering LPFP setup while we swapped the motor.

Anyway, I am a little frustrated with this car at this point. What could possibly be wrong, and what are the next diagnosis steps?

Thanks!

 

[silverstreak18]

Motor will run with a bad HPFP. I would look at the LPFP and make sure a line didn't come loose or something.

 

[NoQuarter]

Agreed. Jumping straight to the hpfp replacement was the mistake. Don't let that get you down- no one ever regretted having a brand new one.

You should be able to measure lpfp pressure.

 

[birrcrin]

I got those codes when one of my lpfp connections melted. Not sure what caused it.

 

[martymil]

what pump where you running ?

 

[smadasam]

what pump where you running ?

Fuel Hanger Surge Tank, BMW E90/E91/E92/E93

BMW Fuel Hanger Surge Tank

www.radiumauto.com

With the single Walbro 450 lph pump.

 

[martymil]

That's a first, did you figure out what happen ?

 

[smadasam]

That's a first, did you figure out what happen ?

not yet

 

[martymil]

To me it looks like corroded and loose connections, that's what normally causes something like that

 

[fmorelli]

Agree. I two cans of DeOxIt - cleaner and silver shield - in the garage. Every connector that ever comes apart gets cleaned and coated. Only one unhappy connection makes for many kinds of headaches, this being an example. Contacts become a weak link as cars get older. And as complexity goes up, as well as amperage draw of various components, well it's not a 1966 Mustang any more

Aside from a bad installation connection, you might want to do a visual inspection for general corrosion on your car. I'd check a few of the ground contact points, especially body contacts. There was a thread last year - a helluva read - where someone was driven nuts by a diagnosis. @Rcboosted2007 stayed on the problem like a cheap suit. The result was that they found a corrosion issue, and it was hidden in a wheel well. I'm not saying this to be hyperbolic, but probably wise just to do a pass through your car and see if you have a higher concern for contact corrosion.

Best of luck, let us know how it goes.

Filippo

 

[smadasam]

As a follow up, this is what happened: Walbro 450 pump burned up.

The Radium setup keeps the stock LPFP as an uplift supply to their LPFP bucket on the other side of the tank. The radium setup also uses the venturi jet pumps to pull fuel out of the tank and into its bucket. The ventrui pump system doesn't work if the radium tank is empty, or if the tank is not sealed.

When we redid the work on this system, we noticed that crossover tube from the OEM pump to the Radium tank wasn't fully clicked in to the OEM bucket. My theory is it wasn't supplying fuel sufficiently to the Radium tank. Then, if that tank is empty, the jet pumps don't work either. Once the Radium tank was empty, the Walbro 450 burned up because of lack of lubrication.

 

[silverstreak18]

Glad you found it! Those walbros aren't too expensive luckily