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Walbro Pump mod

R

Rodd

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Location
Antelope, CA
I got a Walbro pump from PMD cable a month ago but haven't had time to swap it in. I was thinking..... It doesn't have a prime so since the stock pump has a flow through design and is self priming I was thinking of leaving it in the equation. I'm not 100% but didn't I read a thread here that the walbro isn't flow through. Here is my thought, I need to have the walbro between the stock pump and the FFM so the stock pump can prime the walbro, right? I can't have the stock pump in front of the Walbro because it isn't a flow through. Am I correct in my thinking? Once I have the system primed I was going to unplug the stock and just use the walbro. Does anyone see a fault in my reasoning?

Thanks!
 
Rodd said:
I got a Walbro pump from PMD cable a month ago but haven't had time to swap it in. I was thinking..... It doesn't have a prime so since the stock pump has a flow through design and is self priming I was thinking of leaving it in the equation. I'm not 100% but didn't I read a thread here that the walbro isn't flow through. Here is my thought, I need to have the walbro between the stock pump and the FFM so the stock pump can prime the walbro, right? I can't have the stock pump in front of the Walbro because it isn't a flow through. Am I correct in my thinking? Once I have the system primed I was going to unplug the stock and just use the walbro. Does anyone see a fault in my reasoning?

Thanks!
Click to expand...
You could do that but why? I have the Walbro and It will prime itself quick, its never been an issue
 
Not me. Bought a FRC-10 from Leroy. Installed it, and a prefilter. Didn't even think about priming it. Fired up the truck it ran for about 30 sec. to a min. and died. Cranked it for a little, but had no fuel at T-valve. I know Walbro is a flow through because I ended up putting a rag over an air nozzle and put some pressure into the fuel tank until fuel came out the drain hose on the T-valve. Cranked a couple seconds and it fired up and had about 14PSI.
 
Don't know why I had a problem. I just looked up specs and it says it is self priming. That's weird.


FRC fuel pumps

Flow: to 210 lph (55 gph)
Self priming (dry lift) up to 48 inches
Continuous duty life (diesel fuel): >10000 hrs
Weight: 0.83 kg (1.83 lbs)
Pump cycles continuously when power is on
Replaceable filter
Replaceable filter

The FRC-8 was the first FRC pump produced because it is the pump used by all the refers on big-rig trailers. This pump can lift fuel several feet and has a check valve to keep the pump primed.
Part Number Pump
FRC-6
(a.k.a.
FRC-6-1) 12V, 36 gal/hr, 4-6 psi pump
FRC-7
(a.k.a.
FRC-7-1) 12V, 36 gal/hr, 4-6 psi pump
FRC-8
(a.k.a.
FRC-8-2) 12V, 28 gal/hr, 9-12 psi pump [replaces 6103]
FRC-10
(a.k.a.
FRC-10-2) 12V, 50 gal/hr, 12.5-16.5 psi pump
 
If your Walbro will not prime or looses prime you have a plugged tank sock or other restriction on either end of the pump. In my case it was a kinked hose behind the FFM. I also had trouble with plugged tank socks and plugged screens in the bottom of the Walbro.

They will self prime and you do have to open the air bleeder on the fuel filter to do so. A shot of WD-40 into the pump before putting it on helps it prime.

The pumps have two check valves in them and flow on fail.

http://www.thetruckstop.us/forum/sh...look-at-a-dead-Walbro-FRC-10&highlight=walbro

The Walbro is an improved design over the factory lift pump. But they work on the same basic design.
 
1999gmc said:
Not me. Bought a FRC-10 from Leroy. Installed it, and a prefilter. Didn't even think about priming it. Fired up the truck it ran for about 30 sec. to a min. and died. Cranked it for a little, but had no fuel at T-valve. I know Walbro is a flow through because I ended up putting a rag over an air nozzle and put some pressure into the fuel tank until fuel came out the drain hose on the T-valve. Cranked a couple seconds and it fired up and had about 14PSI.
Click to expand...
I had the same issue but determined it was the fact that I didn't top off the prefilter with fuel before installing it. Walbro brought fuel up and pushed that fuel filter sized air bubble down the line...
 
Paveltolz said:
I had the same issue but determined it was the fact that I didn't top off the prefilter with fuel before installing it. Walbro brought fuel up and pushed that fuel filter sized air bubble down the line...
Click to expand...


That's what I'm thinking now that I read they are self priming.
 
Thanks guy's for the info. I am thinking however to keep my stock pump in the stock location and cutting into the fuel line and installing the Walbro. I will unplug the stock and plug in the Walbro to the power connector. This way if and when the Walbro fails all I need to do is unplug the Walbro and plug in the stock.

What do you guy's think about this?
 
Rodd said:
Thanks guy's for the info. I am thinking however to keep my stock pump in the stock location and cutting into the fuel line and installing the Walbro. I will unplug the stock and plug in the Walbro to the power connector. This way if and when the Walbro fails all I need to do is unplug the Walbro and plug in the stock.

What do you guy's think about this?
Click to expand...

The POS stock pump will be leaking diesel fuel out the electrical wires before the Walbro dies. I am not kidding as I have had them do that to me. The stock pump is a restriction. Just test fuel pressure at every oil change or put a gauge on it.

Get the fittings, add some hose and use 1 bolt through a frame hole to mount the Walbro around where the factory unit was.

I have killed every lift pump I have tried. (Factory, Autozone, Carter rotary vane, Mallory gerotor...) The Walbro's have lasted me the longest even on biodiesel and bug slime. 3 month average for the stock units and 1 year on the FRC 10. The FRC died due to bug grit going through it. The rebuilt FRB-5 is still going at 2 years ~30K. It also ate bug dirt and required a rebuild. 550 miles a day at 7 MPG was rough on them.
 
Just saw this.

IMO I would not keep the stock LP mounted on the truck for same reasons as WW just stated. I would however keep it in the tool box on the truck as a back up. In the rare event the Walbro fails it takes 5 minutes to change back to stocker.
Walbro FRC-10 is FOF and for the most part self priming, but sometimes if you have alot of air you might want to help it prime by doing the WD40 trick WW mentioned or force fuel to the pump with low air PSI like 1999GMC said.
On a real hot day and if your tank is full you can also try putting the fuel cap on tight then open the FFM drain, let it sit for awhile, close drain and give it a try. Or one more thing: losen fuel cap, open FFM drain and suck on the hose until you feel like fuel has made it up over the sending unit.
 
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