525EFI Electric Fuel Pump Upgrade?
 

Has anyone blocked off the mechanical fuel pump and replaced it with an electric inline fuel pump?

Which pump is recommended to do the job?

Thanks.

Why´d you wanna do that? I asked once why Merc racing runs the mechanical pump and I believe it was a reliability issue in racing conditions. The only merchanical pumps that give trouble are on old motors that stood for a while.

Because of this problem:

http://www.offshoreonly.com/forums/s...d.php?t=164490

I'll keep my mechanical pump thank you.

It eliminates vapor lock when it's hot, and/or high.

Does require seasonal pm though.

Pesky Varmint

Wow!
Interesting thread!
Like many others including yourself, I hadn´t been aware of this problem on a 525. My friend (who has a 500Efi) told me to diconnect the breather from the pump to the intake.
I´ve got 120 hours on my 2006 motor. I´ll check it!

I looked at a 90 Formula last weekend that look like it had newer EFIs in it. It as still running the old Gen IV water pump steup, without the fuel pump, so someone had added a couple electric holley fuel pumps to get fuel to the EFI pump.
BTW, the problem with it was a failed EFI pump and injector problems. So I'm thinking the electric pump swap may not be the answer.
Gary

Electric pumps in general need ample supply, so in turn the low pressure pump would need to be at the tank.

The more I research, it seems an electric pump will solve the contamination problem, but create a fuel delivery problem.

I've used Mallory electric pumps on Gen V 525SCs with no problems. A lot of electrics are mounted too high or too far from the tank to work well. I dont see why a well put together setup with a 7 psi electric feeding the EFI pump would not work. Just has to be done right.
BTW the electric on the Fountain was 3' from the fuel tank and at the level of the top of the tank. Not good.
Gary

Thanks for the information Gary. That is what I am hoping to accomplish.

Originally I was planning on mounting the low pressure electric pump low in the bilge area where the fuel cut off valve is coming from the tank.

Did you use the fuel pump wire from the ECM to trigger the relay for the low pressure pump?

Sal

I set mine up on carbed motors and used a hobbs switch on the oil cooler port (for trucks) on my gen V motors. But there's no reason I can see to make it more complicated for an EFI motor. Keyed ignition and starter bypass to open and close terminals of hobbs switch, respectively. The common to a relay. Relay supplies current to the pump.
Gary

Mine a 500efi, I mounted mine where the fuel cooler was,same bracket,if you run a return like back the the tank.filler hose it shouldnt vapor lock,or need the fuel cooler.The a1000 pump is running 860hp no probs here.

I think yours has kinda the same bracket,I bet it has a eletric pump. you prob could copy the whipple kit fuel system.

You can see the red pump in the pick

I went through 2 A1000's and 2 Eliminators on my Viper. I couldn't catch a break on the Aeromotive pumps. I have a -12AN sump fitting in the bottom of the tank, so they were gravity fed.

Eventually the Aeromotive pumps weren't able to keep up with horsepower and the failure rate was costing me races, so I ended up installing a Weldon 2345A and that pump is just awesome! Loud! But it gets the job done and then some.

The first ones I had ,they went out also.That was around 2000 to 2003. they redesigned them and so far there holding up.They also knew they had a prob and wouldnt stand behind them,What year was yours.

Ya cant be a Weldon though$$$

This was around the 2004-2005 time frame.

on the Viper? was it dead heading or bypassing? the old ones had a glue prob that held the magnets and would stop up a filter if you were lucky enough to have one after the pump or stop up a injector then vent a pistion.

Just getting ready to buy some pumps, so mallory, holley, weldon or aeromotive?

weldon if ya can aford it

Yes, on the Viper. The pumps would start to not keep up under WOT and lose pressure. The fuel filters were fine.

Just be aware that if you install a full-time electric fuel pump it must be connected to an oil pressure switch to comply with USCG safety requirements.

Don't give your insurance company an "OUT" if you have a claim involving fuel delivery.

Remember, and you probably know this, an electric fuel pump "pushes" fuel better than it "pulls", so it needs to be close to the tank.

You're correct about the Weldon pump, but you need a high ampere alternator to run it AND keep the batteries up.

Wow you're not kidding. My Holley Reds made it 8 years and its time to replace them.

"IF" I were to convert to the electric pumps, I was planning on finding the fuel pump trigger wire from each ECM and use that wire to trigger each relay for the fuel pumps. This way, the system will prime for 3 seconds when you first turn the ignition key as programmed for the existing EFI fuel pump.

This Weldon pump seems to be designed to pull fuel and can be mounted as needed without the worry of cavitation.

http://www.weldonracing.com/product....)_Flow_Through

Here is a picture of the way I installed the Holley marine pumps as a secondary. I added mine at the water seperator.

Have you had any cavitation or thermal shut off problems? How long have you been running this setup?

Zero problems to date. I've been running this for more than 2 years. Very pleased with it, I did not have the mechanical fuel pump on mine. I was having problems with vapor lock issues before I added the 2nd fuel pump. Ever since I've added the 2nd pump I have not had any problems.

I went with Mallory pumps. Installed them mid August and already had my first failure after 2 runs.

That is the pump I run, 4 years now with no problems. On a 540, n/a, 625 hp engine.