8v71 won,t stay running

bobsw · April 06, 2009, 08:50:29 PM

A lot of people say that the fuel pump on the 8-71 / 8-92 are almost bullet proof but I have had to replace mine twice. This is one of the spare parts that I don't travel without.

buswarrior · April 06, 2009, 11:55:00 PM

Here at Big Transit, with a forest of 6V71 running not so long ago...

I have a distant memory, oh, back a decade or a little more, about a broo-hah-hah over the drive for one of the accessories.

The one that was being used was failing prematurely, and there was an upgraded one. One cast, one machined.

Wonder if it's related...?

happy coaching!
buswarrior

JackConrad · April 07, 2009, 04:34:58 AM

I recently watched a mechanic replace the fuel pump on a 8V92. He also replaced the little "drive thingy". When I inspected the drive , I noticed it was not cast and that both of the "ears" were bent slightly. I do not know what caused the ears to bend slightly, but the mechanic said "that is why I always replace the drive when replacing a pump" Jack

bobsw · April 07, 2009, 06:57:37 PM

I did it right the second time and replaced the drive ears.

Lin · April 07, 2009, 07:24:37 PM

I have an extra fuel pump that I found in the bus when I got it. How would I tell if it is any good (without installing it, of course).

Dreamscape · April 07, 2009, 08:01:27 PM

First check the voltage, then take the pos wire and put it on a good batt, tapping the ground wire on the post to see if you have fire.

~Paul~

Lin · April 07, 2009, 08:33:15 PM

It's a mechanical fuel pump like the one on my 8v71 engine. Sorry I did not mention that.

Van · April 07, 2009, 08:42:48 PM

In the manual ,when replacing the fuel pump,it's strongly advised to check the little drive connector plate when removing the pump.Bringing our Eagle home blew a fuel pump in Amarillo,fuel pump main shaft sheered in half due to fuel starvation (collapsed supply line),new pump and 1 drive key later back on the road.

to check the pump you will have to disassemble the pump and inspect the drive gear,pinion ,bushings etc.try turning the square end of the drive shaft,any major resistance? Usually there is a big core charge ,you can get them new(reliabuilt)from DD,a very good spare part to have in the pinch.good luck . Van

luvrbus · April 07, 2009, 08:44:19 PM

Lin, spin the pump with a drill in a little fuel covering the pump if you can not stop the fuel with your finger it will be good or you can check it with a gauge on the out side at 65#. make sure no fuel leaks from the weap holes and you are good to go

Are you coming this way soon we will be leaving here around the 17th heading to Texas and on to Breaux Bridge for the Eagle rally and will be back May 10/12

good luck

Dreamscape · April 08, 2009, 05:26:27 AM

Quote from: Lin on April 07, 2009, 08:33:15 PM
It's a mechanical fuel pump like the one on my 8v71 engine. Sorry I did not mention that.

Ooooops!

~Paul~