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Author Topic: How to install a primer pump  (Read 2959 times)
dougyes
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« on: April 16, 2012, 02:29:31 PM »

I've replaced a bunch of fuel lines and I still get air in the line, especially after the coach sits for a few days. After priming the filter it fires right up. I was thinking of installing a little fuel pump at the tank to add some boost to get it started. Can I put one inline in the fuel line? Advance Auto sells a bunch of inexpensive little fuel pumps. Any suggestions on which pump to get?
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belfert
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« Reply #1 on: April 16, 2012, 02:34:06 PM »

I would figure out why the coach is losing prime after sitting just a few days and then worry about a pump once it is fixed.  A pump would just be a band aid and not a real fix.  My bus can sit all winter and it will fire right up after all that time.
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Brian Elfert - 1995 Dina Viaggio 1000 Series 60/B500 - 75% done but usable - Minneapolis, MN
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« Reply #2 on: April 16, 2012, 02:37:04 PM »

Checked your profile: what kind of bus do you have? Bob
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Bob@Judy  98 XLE prevost with 3 slides --Home done---last one! SW INdiana
dougyes
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« Reply #3 on: April 16, 2012, 02:39:10 PM »

102 DL3 with a series 60
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TomC
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« Reply #4 on: April 16, 2012, 03:09:49 PM »

I agree with the bandaide-my '77 AMGeneral transit bus can sit for weeks and still fires up like I ran it yesterday.
I watched Don Fairchild prime up my 8V-71 after he replaced the head to head cross fuel line.  He first disconnected one hose at a time-filled the hose with Diesel then reattached it. Then filled the fuel filters with fuel and tried to fire the engine.  He did the whole thing 4 times, then it started and kept on running.  While Don has used a primer pump on the secondary filter-which is AFTER the fuel pump-he will not use any kind of primer pump before the fuel pump.  Why-he says that the seals on the low pressure transfer pump can easily be blown out by a primer pump.  If you do put a primer pump in, only after the fuel pump-not at the tank.  Good Luck, TomC
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Tom & Donna Christman. '77 AMGeneral 10240B; 8V-71TATAIC V730.
papatony
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« Reply #5 on: April 16, 2012, 04:09:29 PM »

Doug   some where on the line from the tank to the first filter there is a back flow valve that keeps the fuel from draining back into the tank. start looking back toward the tank it should be close to filterer.      Tony
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Dreamscape
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« Reply #6 on: April 16, 2012, 04:27:24 PM »

I just finished an engine swap. One post I read in the archives suggested what Tom C said. I just finished bought my pump at Oreilys. Installed before the Secondary filter and it worked fine. My system was pretty dry. Clifford also suggested the same location.

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bevans6
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« Reply #7 on: April 17, 2012, 05:21:27 AM »

Here is the type of pump I used.  I used the 24 volt one.  I just put it in line in the main fuel line to the primary filter, on my 8V71 I don't think there is anything that will be hurt by 10 - 14 psi for 10 seconds...   I just run it for a few seconds, you can hear when it reaches pressure and that means everything is full.  If I leave it on, the fuel pressure switch stops the engine from turning over.  I suspect that your main line check valve needs servicing.

Brian
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1980 MCI MC-5C, 8V-71T from a M-110 self propelled howitzer
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Oonrahnjay
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« Reply #8 on: April 17, 2012, 06:22:49 AM »

  (snip)   I used the 24 volt one.  I just put it in line in the main fuel line to the primary filter, on my 8V71 (snip)

    Yeah, but a Series 60 is an electronic engine and they're often touchy about fuel pressure (the fuel pressure is read by a sensor and it's factored in by the computer for Start of Injection timing, Injection Quantity, etc.)  For an ordinary mechanical engine, I think a primer pump is a good idea; for an electronic engine, I'd definitely find the problem and fix it. 
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Bruce H; Wallace (near Wilmington) NC
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buswarrior
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« Reply #9 on: April 17, 2012, 07:16:40 AM »

The new stuff all comes with a priming pump from the factory.

What are they doing?

happy coaching!
buswarrior
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luvrbus
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« Reply #10 on: April 17, 2012, 08:34:25 AM »

Priming pumps don't hurt the seals Don must have had a bad pump seal to start with, on the older stuff 2 strokes that is a 65 psi + pump I have one in the shop I saved for Don took  me 131 lbs of air pressure to blow the seal and it was a wore out pump 

good luck
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Van
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« Reply #11 on: April 17, 2012, 10:38:59 AM »

I can tell you what the fuel pump does not like, and that is to be starved for fuel. I have one with a sheared drive gear shaft (sheared within the pump housing) that I pulled from my old 6-92 in Amarillo bringing the coach home. I was having the same issue LarryH was having (in the other thread) in B-town Ca. cept that I had a collapsed supply line to the primary, which starved it of fuel and lubrication to the drive gear shaft. While stuck in Amarillo waiting for a replacement to come in, I pulled the old one apart and to my amazement, the shaft was separated from the gear and pulled out of the housing. Here's some pix.








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« Last Edit: April 17, 2012, 11:28:14 AM by van » Logged

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Van
Billy Van Hagen
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« Reply #12 on: April 17, 2012, 11:30:12 AM »

My Primer is installed inline, before the primary filter. Almost 5 years, and no problemo's Wink
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Iceni John
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« Reply #13 on: April 17, 2012, 11:35:05 AM »

Priming pumps don't hurt the seals Don must have had a bad pump seal to start with, on the older stuff 2 strokes that is a 65 psi + pump I have one in the shop I saved for Don took  me 131 lbs of air pressure to blow the seal and it was a wore out pump 

good luck
Whew!   Good to hear that.   I installed a Facet-Purolator Posi-Flo 60100 electronic fuel pump for priming, and it's between the primary filter (in my case, a Racor 900FG) and the engine's fuel pump.   I specifically chose this pump because it's for older carburetor-equipped cars which need lower fuel pressure than newer fuel-injected cars.   I think it produces only a few PSI, which I hope won't be damaging any seals!   I've had to use it only once, and after running it a few minutes the engine started right up with hardly a hiccup.   So far, so good.

Thanks, John
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1990 Crown 2R-40N-552:  6V92TAC, DDEC II, HT740, Jake.      Hecho en Chino.     
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dougyes
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« Reply #14 on: April 17, 2012, 01:09:39 PM »

Van, What model primer pump is that in the picture?
Guys, I'll try to find the check vale.
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