1999 ox66 225 fuel pump ground issues

[dieseltruck]

well guys i had to break down and was reffered a mobil marine tech he came out today i was at work but he called and said it's my fuel pump it never lost ground on him but fuel pressure was droping and stalled he said he checked the voltages at pump and all seemed ok when first fired it up it runs fine then shortly it starts running worse he also told me he grounded the pump the motor stayed running but would start running like it was sick fuel pressure bouncing around up and down he disconnected the wires from the pump and wired it hot bypassing the relays and other control components and still ran the same way. he feels the pump is draging or starting to lock up and the hicups and rough ideling then stalling is because the fuel pump is not keeping constant fuel pressure. rod or yam or anyone does this make sense or is he guessing at the issue..thanks for any feedback

[dieseltruck]

i think befor i spend 5 6 7 hundred dollars on a new pump im gonna get a new dvm and amp the fuel pump again im in commerical a/c i know how high amps mess with motors and compressors. i will do what rod said check the amps if its draging or stalling it will show with the amp draw....

[99yam40]

Good thinking, It is always better to test and make sure of your problem before replacing parts.
Just my thoughts.

[rodbolt17]

a mobile monkey



dang

why did I spend so many years geting actual training????
I should have just been a mobile monkey.


then I could make engines run.

sometimes.

[jb123]

any updates ?

[dieseltruck]

no up dates sorry guys i have a new born that has kept me very busy a 3 month old boy he has be a blessing and a bundle of joy! cant wait to get him on the water. the mobil monkey as rod calls it said its the fuel pump im not 100% sure it is he said he disconnected the fuel pump from the system and wired it direct the motor ran good for a bit then started running like crud again with some hiccups he said the fuel pump is draging or starting to lock up causing low fuel pressure that is causing the motor to run like crap i have a new dvm and going to check the amp draw like rod said to see if its over amping.sorry for not posting in awhile been busy with the new member to the family! i will let you guys know how it turns out...

[Tucker]

Hey diesel, what ever happend with this??

[jb123]

are you having the issue with yours Tuck ? thought it was just spring "freshening"

[Tucker]

No issues. Little more than spring freshening. More like 100 hr service. Got a bad 02 sensor and I was searching rodbolt's posts and saw this one. Looks like a real beaut and was courious as to the outcome. Looks like one of those things that would drive you crazy.

Right now I'm changing trim seals and there's a freakin snap ring that holds the rod wiper in that's giving me a fit. Digging at it with the dental pick and it just won't spring loose. Doesn't have the little holes for standard snap ring plyers. I'm searching the net for some type of special tool. Never been stumped like this on a freakin snap ring. JB, I think I remember reading you have 200's. They don't have this stupid snap ring.

[jb123]

yea 200s, i keep grease packed on the dust seals,looks a lil ugly but havent had a leak in years

[Tucker]

Got 'em out. Had to put the caps in a vice to hold them steady and they just popped out. Yep, know what you mean about the grease. I also put it on the steering ram. Does look a little ghetto but I think it helps.