Lift Pump Again

[Kent Kuykendall]

Just put in a Geno's fuel pressure gauge with dual senders and a switch. Thanks to the info on this list. This Group is great. The first short trips with it I was getting 14. 5 at idle and never below 9. Today I went on a 2 hour ride empty and it began to jump down to 3 or 4 lbs. at the lites, then would go back up to 13-14 if I would rev it up. Then it would go back down to 3-5 at idle again. this went on for several lites, then it stayed down to2-5 while driving and went down to 0 under short WOT. After the truck sits with moter turn off for a while (got fuel), it would go back up to 14 or so and then it wouldn't be long it would go back down to 2-5 again even at idle it would be 4 or 5.



Has any one else had a lift pump act like this or could the gauge be at fault?



This will be the 3rd lift pump for the truck. (120,000 miles). This one has only been on for 18-19,000.



Kent

 

[Steve St.Laurent]

Welcome to the club - yes, I've seen just that kind of result - 4 lift pumps in 60,000 miles here!

 

[Kent Kuykendall]

Too bad such a great Moter has such a week link.



Kent

 

[Ramafid]

Sounds just like what happened to me. Goodbye liftpump!!!

 

[WyoJim]

Both senders?

Kent, Does it act like that on both senders ??

 

[Kent Kuykendall]

WyoJim,



Yes, Both senders are coming up with the same thing with the exception of the . 5 lb. difference across the filter.



Kent

 

[WyoJim]

I thought maybe the sender was bad, but it don't seem as though both could go at the same time.



If you change the pump let us know what the readings are. I have a Westach that is doing the same thing.

 

[Kent Kuykendall]

Mine is a Westach as well. Do you think it could be the gauge?

 

[Kent Kuykendall]

I have to get to work so I will keep you posted on the problem. I think I will have the pressure tested before I buy a pump. However I think I'll get one anyway and put it in the glove box just in case.

 

[Kent Kuykendall]

results of new lift pump

The new lift pump runs 13-14 psi. at idle. A little less than the old one when it wasn't down to 2-5. But this one hasn't gone below 10. Have not had truck loaded yet. This fuel pressure guage is the best thing I have put on the truck. No more lift pump worries.

 

[Jack in Alaska]

Fuel pressure

Today I installed my Westach fuel pressure gauge. I used a grease hose as a flexible link from the top of the filter to the sender to eliminate any vibration to the sender.

Results: 14 - 15 psi at idle; 9 at WOT and steady.

Original pump and 81k miles on the truck.

Am I lucky or are problems coming soon??

 

[redneckdr]

lift pumps

just wondering if anyone is running a pusher pump back by the tank, and if it would make the stock lift pump run longer and more effectively?? i'm going to install one when i have time. pre and post filter pressure monitoring will come first, then i will see if it makes any difference. when i start the project will post the results. got to get the gauges and get them in first. also, suspect the resonator and muffler are worn out (4. 8k miles), and must be scrapped. i hate it when stock parts fail so early. hopefully they will be gathering dust in the shop by monday am. i'm going to try a "test pipe" first. if i like the sound of the straight pipe thru the 3" system, i'll go back with a 4" or 5" system later. if the sound is obnoxious thru the 3" straight pipe, will have to use one of the muffled systems. BOMBS AWAY!!!!

 

[EricBu12]

4 lift pumps in 60k?

Are you all using an additive to lubricate the pump? I use power service and sometimes the howes lubricator.

I have 15K so far and haven't had any problems but I use the additive EVERY fuel up, even if I am not empty so sometimes I have more than the dosage for the gallons.

I have heard that the de sulphuring process makes the fuel have less lubricating qualities so I use the additive religiously.

Just my thoughts on it. I am by the way, an Over the road truck driver and many truck stops have an additive in their fuel so the corner station is not the best place to get it.

Sorry for the long post but I hope you guys that are replacing pumps have been using additives.

 

[Morphious]

I have a pusher pump, mallory 4150 marine, that I am using. I bypassed the stock unit all together, gut the power wires and ran them back to the mallory. I plumbed in 6an hose from the mallory to the fuel filter and debanjoed it. I have been running this settup for about 70,000 miles or so. I run lucas engineering fuel treatment religiously. I buy it in gallon jugs and serve with every tank full. The truck runs like there's no tomarrow now.



Morph.

 

[Lazy-Boy]

How long should a lift pump last?

Eric,

I've also wondered how much the lubrication in a fuel additive would effect the life of the lift pump. I also use a fuel additive at every tank. I don't have a pressure gauge yet and I've only got 20k miles on her so far. But I don't have any of the symptoms of a failing lift pump either.



The arguments over the benefits of fuel additives has been going on forever. This might be a good time to get some stats. Why don't I put together a poll.



Before I do that let me get some feed back from you guys. How much mileage occurs before a lift pump fails under normal conditions? I think the failures after a normal life-span should be left out of the poll.



I was thinking I'd set up a poll that would only be answered by individuals whose lift pumps have failed within a certain number of miles. Then have just a yes or no answer to whether lubrication-type fuel additives were used or not. Is there anything else I'm not thinking of? If not, then someone tell me what the normal life span of a lift pump is and then I'll put a poll out there.

 

[RAMalama]

QUICK EASY FIX

I just simply added an extra fuel tank in the bed to provide "head pressure" to the lift pump. This way, gravity is working for the pump and not against it.



And at only 1 million gallons at 7. 4lbs per; it weighs a light seven million four hundred thousand pounds.



#ad




If anybody else want to shoot this lift pump thing in the heart just look me up. You might want to up grade to an E rated tire though.

 

[RAMalama]

Oh yeah, I only have 10,077 on the clock now so I figure when I hit seventeen million eight hundred forty three thousand, two hundred and one... - I'll fuel up and check milage. Should be in the year 2110.



Doc Tinker? what have you done!?!

 

[Bigsaint]

lol@RAMalama, bet you get real good traction in the snow .



Scott W.

 

[Valkyrie99]

A few weeks ago I replaced my pump after a filter change. When I went to prime the canister, lots of noise and no fuel. Decided to cut it open to maybe see what the h*!! is wrong with these things. I removed the top cover and the vanes and surfaces they contact looked like new. Not even any real scratches. I hooked the pump up to a 13 volt bench supply and ran it for a few seconds. When I first fired it up, it ran slowly and within about 10 seconds it really took off. Maybe because it was dry. Fuel actually is pumped through the motor for cooling and lubrication. Couldn't do that with gasoline.



I cut the bottom open with my bandsaw and was hoping to find bad bearings or something. Both the top and bottom bearing and armature shaft surfaces looked felt fine. No scuffing on the magnets or armature. The brushes did look a little scared but weren't really worn down so as not to work. I ohmed the armature and really didn't find anything that looked out of place. It would be hard to tell if windings were shorted to each other. There were none shorted to the shaft.



So my next experiment will be to unwind the armature and see if anythng pops up there. Probably why Cummins and Carter are having trouble fixing it, they may not know what the problem is. My suggestion would be to not run the fuel through the motor. A film could be building up on the brush contacts from anything in the fuel. Hummm, why do we have to change our filters so often?



Thanks for listening to my ramblings.

 

[EricBu12]

Put the poll out!

Hell yes, get a poll going, what you said sounds good. If the ones that had a failure, did or did not use additives and such and the mileages for both.

Set one up and I'll put my chad mark on. (is that a vote or not?... . ) lol, Seems like we need to go to electronic voting for the new elections, screw the old paper way.