Fuel System Questions

[jetjock]

Different quality tolerances.

Actually there is very little difference. I know this from having overhauled several that were used in both applications. The pumps are the same other than minor details that don't effect pumping fuel and I know more than one aircraft owner who saves a bundle by using racing pumps. I myself learned long when dealing with Weldon to say it was for a race car and not an airplane, otherwise the price would double.

Why? Certification, paper trails, liability and overhaul issues, on and on. You'd have to understand how the FAA works to "appreciate" just how much a aerospace part's cost often has little to do with it's quality versus a similar part used in motorsports. Take AN hoses and fittngs for example. The quality is nearly identical but the price isn't. It's your gum'mint at work. The bottom line is Weldon makes an exceptional pump no matter where it's used.

 

[poorboyj]

Agreed. These fuel pumps are very popular amongst motorsports teams such as Motorola cup cars, touring cars, WRC cars, and JGTC cars. This pump comes factory on a Porchse 993 whose engine costs something like $40,000. These are OEM quality fuel pumps that have outstanding flow. Even the Aeromotive A1000s have a relatively high failure rate, not as bad as Walbro though. And at $220, you won't find a better price. My connection at Porsche revealed they get them from Bosch for $300, and sell them for $4-500.

 

[figgie]

Agreed. These fuel pumps are very popular amongst motorsports teams such as Motorola cup cars, touring cars, WRC cars, and JGTC cars. This pump comes factory on a Porchse 993 whose engine costs something like $40,000. These are OEM quality fuel pumps that have outstanding flow. Even the Aeromotive A1000s have a relatively high failure rate, not as bad as Walbro though. And at $220, you won't find a better price. My connection at Porsche revealed they get them from Bosch for $300, and sell them for $4-500.

that is the 044 denso pump

it is not stock on the porche

edit::

lol my reading is bad. i saw bosch, read bosch understood denso.. lol. You are right

 

[poorboyj]

Now you're confusing me. The one I posted is a Bosch. And it is the part number, 0 580 254 044. I am not aware of any other Bosch Motorsports fuel pump that is used on WRC Rally cars. If you have additional information on this, please inform us all.

 

[figgie]

oops

dunno why i kept reading bosch and understanding Denso... not my day today. Anyone know what the Bosch 044 pumps internal are made out of?

 

[poorboyj]

If you are wondering they are not rated for use with methanol. Although, you could possibly get away with it for a while if you ran a lubricant with the meth and flushed the system afterwards with gasoline.

 

[Boostin88T]

This thread is starting to confuse me...lol

 

[suprarich]

Well, I've seen 4 of them die so far and heard of several more, just from the local Supra owners here on the Island. Now you've heard too.

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James, LMK if you'd like to swing by or something.

All pumps have failures, walbros are cheap, but I still don't count them out. The number of them used day to day vrs the number that fail premature in my opinion is not high enough to say that they are junk. ALL pumps have failures, even the 1500.00 dollar gear drive fuel pump on my drag bike has failed, and it is the best in the world. Another alternative is the stock pumps from a TT supra. Two of them would do the HP and a little more reliable then the walbro.

 

[chevyeater]

All pumps have failures, walbros are cheap, but I still don't count them out. The number of them used day to day vrs the number that fail premature in my opinion is not high enough to say that they are junk. ALL pumps have failures, even the 1500.00 dollar gear drive fuel pump on my drag bike has failed, and it is the best in the world. Another alternative is the stock pumps from a TT supra. Two of them would do the HP and a little more reliable then the walbro.

I should clarify my position. The Walbros have an acceptable failure rate when used in a single pump application. When you put two in the same tank, the failure rate skyrockets way past unacceptable IMO. The illusive "doing it right" putting the dual Walbros together is pie in the sky. They just interfere with each other, probabaly due to the cheap design.

2 MK4 pumps would require significant modification to the fuel tank, due to the physical size of the pumps and the hole in the tank.

 

[poorboyj]

Just go with a Bosch 044. Seems to meet all of your requirements while retaining OEM reliability. Plus you can't beat the $220 from http://www.jayracing.com/products.htm anywhere!

 

[SublimeSupra]

My brother in law has twin walbros in his 800whp rb26 for 2 years now no problems.