Engine/Transmission (1998.5 - 2002) Mallory pump died but then....

[WAYNE]

The truck restarted , is this the beginning of the end for this pump? I came to a stop the truck started to stumble , just as I pulled off I noticed the fuel pressure drop to zero , seconds after the truck died. I turned the key, no fuel pressure tried to crank it anyway , nothing. After a couple minutes turned the key, fuel pressure and the truck started .

I drove to work today no problem's , this is a mystery to me. I'm about to make a 2,500 mile trip and don't want any problems on the road , in anticipation of this I bought a spare pump , should I be worried ? when these pumps die are they intermittent or do they just quit. Maybe i'll put on the spare now and just replace the brushes in this one , what do you guy's think?

 

[GLASMITHS]

IMHO - It would be safer and more convenient to do it at home than on the side of the road with all the PSDs and Chebbys going by to see you

 

[Shovelhead]

I'd replace it now.

If your luck is anything like mine, the old one will crap out in a pouring rainstorm at 0:dark-thirty in the middle of BFE.

It's easier to change it in the driveway.

Call it preventive maintenance, and peace of mind.

 

[dmurdock]

replace it and re-build the other one... also a good time to look for loose/corroded wires which could be the cause of the problem in the 1st place. .

 

[Bigsaint]

Wayne, if you already have a spare pump, replace that Mallory now, before it leaves you stranded. I've been through 3 Mallory pumps. They start off typically showing slightly lower readings than normal, may do this for up to 2 weeks. Next comes erratic psi's under throttle, talking about swings from 12-6-10-3 psi's all while under the same steady throttle. Last but not least is what you are seeing now, the gerator is completely stopping and then starting. Your pump is very close to the end and I can tell ya first hand that the VP44 will not suck enough fuel through a dead Mallory to get you home. The VP44 will pull enough fuel for a idle, forget about driving with 0 psi's and a dead Mallory. I tried when my first one died and then restarted. I went about a 1/4 mile and then shut her down, alot of stumbling under even the slightest throttle and not good at all for the injection pump.



edit... forgot to add. If you want to continue running the Mallory, you have 2 choices. You can buy a brush kit and replace the existing brushes, cost is about $15. 00 if I recall correctly. Or, you can send the pump back to Mallory for a complete overhaul, cost is about $50. 00. Either way it will die again on ya, they just aren't built for continous duty IMHO.



Scott W.

 

[Jetpilot]

If you are using a relay to supply the power to the pump you might replace it... . I had a similiar experience with my Mallory and this was the problem. But, when it finally decided to leave me it did the way Bigsaint described.



Doug

 

[Morepower]

I also bought a 4140

Is the 250 racing pump any better? I also bought one of those as a backup. What is everyone switching to now? As far as failing during the worst time, will the new replacement work during the winter in below zero temp? I am also using a relay off the ignition power wire. So what are people doing without a relay? The problem I would have without a relay is my turbo auto shut off so I can walk away and do not have to wait for the turbo to cool down.

 

[Bigsaint]

I think the 250 pump will die quicker than the 140 series. Maybe not with a return plumbed in, but for sure without a return regulator as it will simply beat itself to death. There really is now latest and greatest that has been tested, other than CSuttons set up using the Aero pump. The PE 4100 that I am using, among others here, is still too new to start raving about in regards to longevity. Mines been on for almost 5 months now, works like a champ. Problem is that 5 months is baby$hit, my best Mallory lasted 8 months without a hitch.



I'm not quite sure what you are asking regarding a relay ? The best route with these aftermarket pumps is to use a relay. They draw more amps. than the stock Carter pump. If you take a look at the wire which runs from the ecm to the stock pump, it's pretty thin and is better suited as a trigger wire for your relay. Here's a link to the PE pump some of us are R+D'ing right now. Try it at your own risk as it just hasn't been proven yet. Good thing is that the pump has a 2 year warranty ( yep, they know we are running it on diesels) and is built like brick I TRIED TO BY-PASS THE CUSSING FILTER house. Price is around $300. 00.



http://www.productengr.com/PE_4300.htm



Scott W.