• Welcome to The Truck Stop! We see you haven't REGISTERED yet.

    Your truck knowledge is missing!
    • Registration is FREE , all we need is your birthday and email. (We don't share ANY data with ANYONE)
    • We have tons of knowledge here for your diesel truck!
    • Post your own topics and reply to existing threads to help others out!
    • NO ADS! The site is fully functional and ad free!
    CLICK HERE TO REGISTER!

    Problems registering? Click here to contact us!

    Already registered, but need a PASSWORD RESET? CLICK HERE TO RESET YOUR PASSWORD!

Walbro / Racor install

O have a Racor 230R2 filter mounted on DaHooooley. I made a bracket and bolted it to the inner fender using the two front bolts on the ABS module right alongside the alternator (95 Truck)

Used the stock lift pump and feed from the pump from through to the Racor and then jumper over to the IP.

The Racor has its own drain/water bowl and a heater is available if need be..

One needs to use a 2 micron filter ahead of the IP to be sure to keep the IP healthy.

If you get into marginal fuel quality a primary filter of 10 micron may be in order too.

The factory filter is way too small and also a mess when changing filters along with being a tad loose on the microns.

The factory filter will keep out dead birds and large rocks.

The 2 mic will keep the IP healthy.

The nice part of the Racors is that one can observe the bowl and see of there is any water or crud

MGW
 
Matt Bachand said:
Well I took it for the hardest 'beat' I've laid upon her since Early PMD failures before These forums were found, and I was trying to blow it up :).

ON the steepest highway grades I know, 11psi boost, 65-75mph slowing down and throttling back in to acceleration, I could never get it to drop under 3 psi. Most of the time it stays a touch above 4.

What do you guys think? It was dead quiet this morning, jumpered LP diagnostic connector and I heard it make a quiet click or 2. Can't hear it at all. Like i said, i have a 3/8ths piece of solid rubber 'pad' in between walbro and frame, mounted with SS 1/4 nuts and Bolts.

I'll get some pictures, although Its hard to show the complete picture.
Click to expand...

I would say if you are not droping below 3 psi and not starving for fuel then you are good. Mine runs 3-6psi. Mine also at idle just ticks slowly because the pump is sending less fuel. When the engine needs more the pump senses it and sends more. At those times the pump purrs along.
When you jumperd the pump it did just what it is supposed to. With the engine off you dead headed the pump so the pump will tick a couple times stop pumping then wait for a need to pump again.
Its a long shot, but it is possible some junk got into the pump screen. You might want to inspect it.
 
10 micron pre-lift on mine, then factory 5 micron after that, 2 mic is overkill IMO in our truck but 3 filters 10-5-2 mic would be ultimate in filtration so long as you don't diminish fuel delivery with too fine a media or too many filters egro why you would nedd a higher delivery lift pump.
 
Last edited:
Burning oil said:
I would say if you are not droping below 3 psi and not starving for fuel then you are good. Mine runs 3-6psi. Mine also at idle just ticks slowly because the pump is sending less fuel. When the engine needs more the pump senses it and sends more. At those times the pump purrs along.
When you jumperd the pump it did just what it is supposed to. With the engine off you dead headed the pump so the pump will tick a couple times stop pumping then wait for a need to pump again.
Its a long shot, but it is possible some junk got into the pump screen. You might want to inspect it.
Click to expand...

Perhaps its just a quiet pump. Like I said I did drive it harder and stronger than I ever did and it didn't drop below 3, not even close. It defanately regulates itself fast to maintain.

Any other opinions?
 
I get 6-7 psi at idle, drops to 4-5 psi under moderate load. I can definitely hear it during glow cycle, ticks over fast then slows as pressure builds.

It would be easy to just go with it since your pressure is holding under load, but I'd swap it out for a new one. The lack of volume makes me think there really is something wrong, and as your filters begin to load up and put more restriction on it you may run into trouble. The Walbro DEFINITELY should have more idle pressure and volume so you know something is wrong, get the pump swapped for a new one and I bet you see the difference.
 
I wonder how an Airdog or a Fass would work on these trucks ? Also if the DS4 starves for fuel due to LP failure(from a non flow on fail LP) will the DS4 get damaged ? The one thing Ilike about the DS4 is it can usually get you home with a dead factory LP. ON Cummins of the LP dies you probably only have seconds before imminent IP death of the VP44 which makes me wonder if the factory LP was flow on fail to prevent that ????
 
Dave01 said:
I get 6-7 psi at idle, drops to 4-5 psi under moderate load. I can definitely hear it during glow cycle, ticks over fast then slows as pressure builds.

It would be easy to just go with it since your pressure is holding under load, but I'd swap it out for a new one. The lack of volume makes me think there really is something wrong, and as your filters begin to load up and put more restriction on it you may run into trouble. The Walbro DEFINITELY should have more idle pressure and volume so you know something is wrong, get the pump swapped for a new one and I bet you see the difference.
Click to expand...

I have to agree with this.

I also have stock PCM, the entire purpose of going walbro is to have more than enough fuel at all times. How is this going to handle a GL-4?

Guy gets more than 4 times the volume of fuel out of his, and he is running it through a 2 micron prefilter, I'm running it through a 30.

Even when there is no pressure it doesn't tick over fast. I will do another volume test today. It's so low I can use a measuring cup instead of a 2 liter volume of fuel.

It may hold up to my stock PCM setup now, but when the drain valve is opened, thereby relieving all pressure (over-simulating the engine drawing max fuel), it still doesn't adjust itself to output enough fuel.). It is getting out-performed by my AC-Delco unit for 93 specs.

I am going to have to try a new Walbro unit.

Leroy, can you test one on your inventory to verify pressure and send me another unit? Please pre-prime it so its not dry pumping. This one is way out of spec.

No where near 45 GPH, no where near 10psi.

My volume is just way too low. I don't want to be starving my IP or making it do more work. The whole point of walbro is to make sure IP is getting enough fuel at all times. I have a FTB filter manager awaiting install, but I almost don't feel the point if this pump isn't putting out to spec.

My primary FLT MGR Fuel filter is 2 months old. ANd Verified good by scock LP getting more flow and more PSI than the walbro. Should not be that way.
 
FRB5-1 Pump Specifications:
Voltage: 12vdc
Minimum Flow: 45 gph
Deadhead Pressure: 8.0 - 11.0 psi
Max Current Draw: 2.3 amps
Life: >18000 Hours
Dry Lift: 48"
Inlet/Outlet: 1/4-18 NPSF
Electrical Connector Two Leads, No Connector
Inlet Filter Screen: 70 Micron
Corrosion Resistance: 96 Hours Salt Spray Test (ATSM B-117)
Outlet Check Valve: None

Image of Mounting Flange and Included Components

I'm falling 1/2 of that dead end pressure, and 1/4 of that MINIMUM flow.
 
Try it this way: disconnect the hose going from the pump to the engine at my bypass fitting and see what kind of volume you get. If you get plenty this way then you have a resriction in the line or FM. Try blowing it out. (that happened to me once) ( I have a post here about it) If it is still low try it again without the Raycor before the pump. It could be a problem with the rebuilt Raycor because it was "rebuilt" for some reason.
If you still have problems I will refund you. Don't take this with any hard feeling, but I would rather just refund you (if thats what it comes to) as I only charged you $10 more than I paid for the pump.
Let me/us know what you find.
Leroy
 
I am runnig a Racor 230R2 filter on DaHoooley and have for over a year prior to the overhaul.
The 2 mic filter has never given so much as a spec of trouble.

The IP and injectors love the clean fuel.

5 mic is a clod sifter IMHO Keeps out the big pieces.

The DS pump needs very clean fuel. One issue that can and does pop up is wear on the fuel solenoid. These are very critical parts and dont like dirt.

The DB series pumps are a little more forgiving but still, Clean is good.

The 2 mic would be a tad tight if the fuel quality is poor, but then again why would one want to run crap fuel through these systems.

The GM factory filter is way too small for these trucks IMHO.
They chose the 5 mic because it would function and not be too tight under most conditions.

I have pulled the filter (factory) from the burb and the amount of crap that is in that thing is amazing.
I buy all my fuel from a large chain Cardlock truck fueling station. These guys have filters at the pumps too but there is still a fair amount of junk that gets through.

The price of the injection components on these rigs makes the 2 mic Racor look very good me thinks.


Best

MGW
 
Burning oil said:
Try it this way: disconnect the hose going from the pump to the engine at my bypass fitting and see what kind of volume you get. If you get plenty this way then you have a resriction in the line or FM. Try blowing it out. (that happened to me once) ( I have a post here about it) If it is still low try it again without the Raycor before the pump. It could be a problem with the rebuilt Raycor because it was "rebuilt" for some reason.
If you still have problems I will refund you. Don't take this with any hard feeling, but I would rather just refund you (if thats what it comes to) as I only charged you $10 more than I paid for the pump.
Let me/us know what you find.
Leroy
Click to expand...

I will try that Leroy. I already tried the system without the Racor in place, I will try it that way.

Tried it and I had to stop after about 15 seconds as it would have easily filled the 2 liter soda bottle up in a few more seconds. So PLENTY of flow out of the Walbro, this is WITH the racor installed.

I cleaned out the line from walbro to filter mgr, and no change, no crud.

So, The walbro is putting out PLENTY of volume. Not sure why such the restriction from my t-valve but that is irrelevent.

Walbro = Good.
 
I also hooked my pressure gauge right up to the end of the walbro while I had things apart again.

Same pressure reading.

I'm not sure why the dead-end pressure of thse pumps are so low, when they are rated at 10psi.

I'm not saying its just my pump either, I have searched A LOT and pressure readings are always 3-5, or 6 or so. Why they rate these at 8-10.

It will probably last longer at a lower PSI, but I still don't understand why so low.

I was expecting 10+ to be honest. Not that it matters, if IP has its required volume all is good, but why does Walbro rate these (AND STAMP THEM) at 10 psi when directly out of the walbro's ass is reading 5 or so Dead ended.
 
Mine goes to 12 dead headed but my gauge is not top of the line, but is on par with my combination. vac/press test gauge. Ever consider your pump may be bad, if it's making delivery any you are happy with it fine, but from what you have described "quiet" and lower psi than most who are running them. I suspect something isn't quite correct with it.
 
I'm with Turbine Doc, I still think something is wrong. Mine deadheaded shows a bit over 7 psi at the T-valve, I've assumed the pressure drop is from the stock filter and the fact that the T-valve is a few feet higher than the lift pump. I've never tried it directly out of the Walbro.

You proved there was a large volume drop at your T-valve as opposed to an open line from the Walbro. That could be something obstructing the line, the filter, or the valve itself not opening completely. But, deadhead pressure shouldn't be affected by the volume drop, and you still show only 4 psi directly out of the pump. Matt I agree with you, why do they rate them for 10 psi and most of us get less than that, but 4 psi is definitely not normal performance for that pump.

Do you still have the sock in the tank, could that be reducing the performance of the lift pump? The final test would be to just pull fuel out of a pan.
 
Dave01 said:
I'm with Turbine Doc, I still think something is wrong. Mine deadheaded shows a bit over 7 psi at the T-valve, I've assumed the pressure drop is from the stock filter and the fact that the T-valve is a few feet higher than the lift pump. I've never tried it directly out of the Walbro.

You proved there was a large volume drop at your T-valve as opposed to an open line from the Walbro. That could be something obstructing the line, the filter, or the valve itself not opening completely. But, deadhead pressure shouldn't be affected by the volume drop, and you still show only 4 psi directly out of the pump. Matt I agree with you, why do they rate them for 10 psi and most of us get less than that, but 4 psi is definitely not normal performance for that pump.

Do you still have the sock in the tank, could that be reducing the performance of the lift pump? The final test would be to just pull fuel out of a pan.
Click to expand...

No sock in tank.

I did check pressure out of a pan of fuel at t-valve. 4-5.

pressure at t-valve and pressure at walbro's ass read the same.

When open pumping right out of the walbro it ripped fuel out and was clicking away like a bastard.....

I don't know.

I saw the amount of huge volume with my own eyes so there is no way in the world my engine can possibly use more fuel than that, or i'd go through 20 gallons in 10 minutes......

It must be the internal regulator in the pump itself.

I have another fuel manager FTB'd out, havn't got around to installing it. Still have a few misc things to round up. I'll do that and permanent gauge soon.

I still need the fitting that attaches to the IP if anyone knows what to order.
 
96 OILBURNER said:
The fuel doesn't go through the filter to get to the T-valve.
Click to expand...

NO, but it does get restricted really much so. I was looking at the FTB'd maganer I have uninstalled, and it is defnatley not an easy shot. Its not a direct hole through. It does seem to go through the unit passages and out a very small outlet.

I can't explain the lack of volume out of t-valve, unless the hose is clogged between my flt mgr and my t-valve, or my t-valve is not opening all the way or who knows.... If that t-valve was flowing what the walbro's ass was flowing it would be spraying around like a loose firehose shooting a 1/4 (1/8'th?) inch stream of diesel 20 feet i would think....

When I install perm pressure gauge I will check flow going into IP.

If it was a matter of running down to the store to swap pumps, i'd probably do that, but its not. I do have plenty of pressure, and the second it senses relief it regulates itself up to make more, even pulsing higher than original and stedeies out easily at 4... Extreme fuel draw, climbing steep highway hill, 11 psi, NOT WOT, but must be close, could never get it to even think about going lower than 3 with instant recovery....

Maybe it will break in.. lol... who knows... She runs. Good as ever.
 
You must log in or register to reply here.
Back
Top