Fuel pump replacement

I used the poorman way to check for spark by removing one coil pack cap and having my son crank the engine.
Yup, got spark.
 
Nyghtshayd said:
Yup, got spark.
Click to expand...

OK. :D

Got fuel pressure?

See if the local auto parts store has a fuel pressure tester(fancy name for pressure guage and hose adaptor) for sale or rent. Attach the tester to the schrader valve on the fuel rail. Cycle the key on/off(do not crank) a half dozen times and observe for fuel pressure. It should be just under 40 psi.
 
That SCHRAETXYZ... valve is on the driver side of the fuel rail right?
Well I did the poorman way of checking and disconnected the bottom hose to the filter then key-on/cranked it expecting fuel to shoot out but got nothing.

What next?:roll_over:
 
If you got no fuel at the bottom fuel filter hose, your fuel pump is dead, or doesn't get power for some reason.
 
Last edited:
Nyghtshayd said:
Well I did the poorman way of checking and disconnected the bottom hose to the filter then key-on/cranked it expecting fuel to shoot out but got nothing.
Click to expand...

No need to crank it to check for fuel - if it doesn't start, the pump will not run any more than if you simply cycle the key on. When you turn on the key, the fuel pump runs a second or so - or it should. If it doesn't, try the 'poorman' way - get a mallet and beat on the bottom of the fuel tank near the passenger side rear wheel-well - that may wake it up.
 
First of all, Thanks for your attention to this matter and quick responses.

Well, if I need to mallet the tank to wake the pump up, then it may need a new pump, right?
 
(orbit gum commercial)FABULOUS! I just bought a Walbro for $53... I just hope Im not just throwing parts at the problem. I tested just about everything.

Thanks again Every One.
 
I got the pump today, I checked the instructions that Driller sent me, and, DAGG-NABBIT! I got a half TANK-O-GAS!!!!!:confused-red: :banghead:

The car doesn't start so I cannot drive it to almost empty...!!!:mad-tilt:

Oh come-ON! I only have Jack Stands! You mean to say I gotta buy wheel stands and PUSH the car up it?!?!?!

Someone please double-cap me in the head!:roll_over:

How does one test the connection of the fuel pump?

Thank you.
 
Last edited:
I did mine with a floor jack and two jack stands.

I jacked up the passenger side of the car and left the drivers side on the ground and put the jack stands under the passenger side of the car.

In order to test the fuel pump connection you would almost have to drop the tank to "get to it".. if you wanted to verfy voltage AT the pump..

so you might as well just go ahead and drop the tank and change the pump.

Your going to have to lower the tank to get AT the fuel pump connection to verify voltage AT the pump.

I'm sure you could verify voltage some place "upstream" but it wont tell you that you actually HAVE voltage AT the pump.

As for the amount of fuel you have, you CAN pump the contents of the tank out, but it's a very dangerous procedure.

I used a remote pump dropped into the tank and pumped mine dry..you must pay careful attention to safety when working with a plastic gas tank and gasoline in general because static electricity can really "wreck your day" if your not careful.

Honestly I wouldn't suggest using a remote pump as I did, I dont know if your experienced enough to mess around with a remote electric fuel pump in such a volatile enviroment in the presense of an explosive liquid in a non grounded plastic gas tank.

Be very careful with your plastic tank, with a substantial amount of fuel inside it will be very easy to warp, bend/distort the tank when it's free of it's straps.

loosen the straps and lower it to the ground with a floor jack and maybe a piece of wood/plywood to support the tank.
 
My son just replaced his fuel pump last saturday, with the help of a friend, the pump itself was not the problem the hose that goes into the tank was deterioraated at the top part, hence why it ran well when the tank was full! but he replaced the whole unit($200) but a 1.00 part was the faulty part! but now he won't have to replace the thing for a good long time! here is his link http://mark8.org/vbulletin/showpost.php?p=120295&postcount=79

they used drillers(i think?) and J's directions, thanks guys!!!
 
could be alot of things, thunk clunk isn't really helpful.

you need to get under or beside the car and have someone turn the key so YOU CAN TELL US what the thunk clunk sound is..then we can tell you how to FIX it.

It could be your suspension has some bad parts and when you turn the key the air ride starts making your suspension make noises.
Who knows, as I said before.. you need to tell US what the sound is, and we'll tell you how to fix it.

Hey, I heard a sound it went BZZZZZZZ.. do you know what it was?
{see what I mean)
 
:rolleyes: :p
I described it from an earlier post.
I believe you answered it. Anyway, Im gonna try and pull this off tomorrow after I detail someones car.

Thanks again.
 
:lodrules:
It took me a day but I finally got it done.:big-grin:
My fuel pump is in and Nyghtshayd is running again!
My rusted exhaust broke clean after the CAT so now I have to get it clamped(I don't like her loud):cool: I had to take the tank down with 9 gallons in it, that was the easy part. I had to dump the gas into a rubbermaid...

After doing this job, ALL BY MY SELF!!! I feel like I can handle most any other that comes up!:laugh:

Thanks Guys! :wave022:
 
Nyghtshayd said:
:lodrules:
After doing this job, ALL BY MY SELF!!! I feel like I can handle most any other that comes up!:laugh:

Thanks Guys! :wave022:
Click to expand...

Well done sir!

You have just completed one of the hardest repairs for the mark 8.. if you can handle the gas tank removal, your "in like flint".

(applause)
 
You must log in or register to reply here.
Back
Top