Our 3 month old PE4200 just kicked the bucket and we had another pump on and the pump after it blew 5 or 6 fuses it stay for about a minute with the engine running at 80 psi! Now we have no fuel pressure becuase we were tired of changing fuses and now 1600 RPM and above it misses. Is the 8-AN line too big for the injector pump to suck fuel or becuase we had 80 psi we wrecked the injector pump. Right now the pump is on its way to California and the Comp is on its way to utah and the truck is at the shop just sitting there. so anyone that can help, please do so. Thanks

 

Nobody? Come on somebody must know something.

 

I just bought a 2 month old PE4200 cause my Holley Black was pushing over 30psi at idle. I hope this pump doesn't crap out. I can't afford this. If this pump dies, I'm putting everything back to stock (including stock pump and line) and I'm going to let Dodge replace the lift pumps under warranty until I can find a pump that doesn't keep screwing up. 80psi of FP? You probably blew the seals in the injection pump. Anything over I think 25psi for a length of time can blow seals. I don't know why that would cause the fuses to blow though. Why did your PE pump kick the bucket? The -8 line shouldn't be to big. Countless number of people are running that just fine. Heck, Rod at Wildcat is selling a -8 conversion kit.

 

BigBlue is right about too much pressure destroying the VP44.
The line diameter doesn't play any role on the fuel pressure in your situation. A bigger line will help you to maintain high enough fuel pressure during a high demand situation. With the engine at standstill fuel pressure would read the same with a line thin as a hair or a big line. I assume that the bleedoff valve of your VP44 has also been stuck.

Pumps like the holley blue do come with a fuel pressure regulator for the gassers. This regulator can be adjusted to 15psi and will bleed off excess pressure into a return line. If you mount the regulator post filter ou will have very stable fuel pressure regardless of the drop under high flow situations with a restrictive filter. A pump blowing fuses is a sign of too much torque demand on the pup motorand therefore of a bad pressure regulator valve.

Just my 2c

AlpineRAM

 

with the fuel line the injector pump is sucking the fuel through that large line with no help from a pump. Also the pump we were using was a Malorry High performance pump that needs a return line to the pump not to the tank. But the way yous are saying we need to replace the seals in the pump than. we will find out once we get the pump back hopefully today. And ill tell yous what happens when we get the comp back from getting the Drag version installed and i will post dyno results too.

 

It really doesn't matter whether the fuel line is small or big if the VP44 has to pull the fuel by itself- actually the bigger lines will be a little better than the small ones- less restriction means less vacuum.
If the Mallory fuel pump needs its own return line it ghas the regulator built in. The regulator does just divert the flow of fuel so that the desired pressure is maintained on the engine side. The rest is sent back to the fuel tank. If the pressure regulator doesn't work you will see high pressures and the torque on the pump rotor will need lots of amps for the pump.

I hope that you'll get a good VP44, a nice lift pump and a fun drag comp ;D

AlpineRAM

 

With no supply pressure the VP44 is going to sputter and stumble at anything over an idle. It just can't pull enough fuel... especially through an idle lift pump. You *can* drive the truck without a lift pump easily and for a short distance if there is no pump clogging up the supply line. The 80 psi isn't good for your VP44's seals, but hopefully it didn't blow anything out. Getting fuel pressure to your pump should solve the stumble.

John

 

banshee: My VP44 did do well without any (working) lift pump for quite some time. No sputter, no lack of power, just a little louder mechanically (was still stock then, and didn't know about this site)- the VP44 has a rotary vane pump inside that will supply fuel to the high pressure side.In applications like the 3.0 BMW the VP44 is used without a lift pump. The main difference is the macimum volume per injection at low rpm. The rotary vane pump is not too good at low rpm as we have them in the CTD.
If you have an obstruction in the fuel line the VP44 will not get fuel and the truck will sputter above idle or even quit running altogether.

Just my 2c

AlpineRAM

 

Alpine,

My PE pump (the 2nd one) died last week and I was forced to drive it about 10 miles at 20 mph because it was sucking through the dead PE pump and would studder the pump horribly. I agree the VP44 will suck the fuel if there are no restrictions, but with the pump in the way like CumminsDieselBoy has he is experiencing the same thing I was.

 

banshee: I think that it all depends on what is teh ailment of the faulty LP- mine had the checkball flying around in the inlet and was not too much restriction in any direction, so it worked. If his pressure regulator is sticking and the pump has spring loaded vanes he won't have any significant amout of fuel. I just wanted to point out that the trucks will run good even with a defect LP and slowly ruin the VP44s for other readers on this board.

AlpineRAM