| Author |
Message |
bruce king
Rating: N/A
Votes: 0 (Vote!) | | Posted on Wednesday, April 20, 2005 - 11:46 pm: | |
I want to buy two fuel pumps; one to prime the
fuel filters for the 8v71, and the other to supply the generator -- the tank is a ways from the generator.
I'm looking for suggestions on the brand or source of something to move diesel fuel around. In a previous thread 13-18psi was mentioned.
The fuel line on the 8v71 is 5/8ths inch,
the generator is 3/8ths.
Secondary issue is whether to get one with a pressure-sensitive shutoff, or to work out something to do the same thing for the generator supply pump.
I've located a few pumps around $150 -- what's a good price for these things? |
James Maxwell (Jmaxwell)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Thursday, April 21, 2005 - 12:48 am: | |
Price sounds a bit high but then I have not bought one for some time. Should be able to get a good Bendix or Bendix type universal that is pressure adjustable for around 75-90. You could buy one pump and build a manifold system that feeds both with shutoff valves on each branch. |
Tom Caffrey (Pvcces)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Thursday, April 21, 2005 - 1:23 am: | |
Bruce, it sounds like you have overkill in mind.
If the genset would run on gravity fed fuel if the tank was above the genset, then one of the $50 auto parts store pumps that go 4-8 psi ought to do the trick.
This assumes that there is not much of a flow rate and that the genset is not fuel injected gasoline. If it is, then you will probably want to meet the maker's recommendations.
In any case, priming the fuel filters in the Detroit will only require a few psi and five minutes of operation or so, because the fuel will weep around the gears in the gear pump and the check valve requires very little pressure to overcome.
Once fuel reaches the gear pump, you can start the engine by cranking it, while continuing to run the pump. Give it a couple more minutes before cranking, and all the air should be gone. THEN, shut off the pump.
With heavy equipment, it is usual to use a dead man switch to turn the pump on (momentary on).
It really shouldn't take much for those needs.
Tom Caffrey PD4106-2576
Suncatcher |
TWODOGS (Twodogs)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Thursday, April 21, 2005 - 8:24 am: | |
the place that used to be western auto..Advance auto parts ....30.00 ea. |
Geoff (Geoff)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Thursday, April 21, 2005 - 9:05 am: | |
Autozone also sells $30, 12v electric fuel pumps with a lifetime warranty. There is a 4-5, and a 14-15 psi pump available. For my diesel generator I use the low pressure pump.
--Geoff
'82 RTS CA |
Jim Bob
Rating: N/A
Votes: 0 (Vote!) | | Posted on Thursday, April 21, 2005 - 11:04 am: | |
Absolutely DO NOT make a manifold system using the same fuel pickup/supply line for the genset as for the main engine. The Detroit will starve the genset for fuel & may (I have seen it) suck air back through the genset fuel system causing air in the Detroit AND an air filled genset system.
If you want to avoid fuel problems, install a separate pickup tube & filters for the genset. Cut the pickup tube length so it can only draw 75% of the fuel so it leaves you enough fuel to drive to the gas station.
Jim-Bob |
John Jewett (Jayjay)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Friday, April 22, 2005 - 12:21 am: | |
Hmmm, I must be doing something wrong, 'cuz my genset and 8V71 draw from the same pickup tube and co-exist quite happily...and have been for several years. Short pick-up tube? Why? If a guy isn't smart enough to operate the genset without useing all of his fuel, then he has no busines on the road at all. ...JJ |
Richard Bowyer (Drivingmisslazy)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Friday, April 22, 2005 - 10:29 am: | |
Jayjay, I believe the problem generally happens not on the road, but out in the boonies somewhere when the genset has to run much of the time. Although it never happened to me, I know of a few intances when somebody forgot and drained the tank down and had to find fuel before they could make it back to civilization.
Richard |
Jim Bob
Rating: N/A
Votes: 0 (Vote!) | | Posted on Friday, April 22, 2005 - 11:48 am: | |
No Jayjay, I think you are a lucky exception. I work for Northern Lights generators. We have sold tens of thousands of diesel gensets. We have seen more than a hundred cases in South Florica alone where various brands of gensets were starved by "teeing" into Detroit fuel lines, usually at the Racor prefilter. There would be way more cases if not for the fact that genset makers educate boatbuilders & the public not to install that way, and also that Detroit two cycle engines are almost never used in new boats now.
Jim-Bob |
Chris
Rating: N/A
Votes: 0 (Vote!) | | Posted on Friday, April 22, 2005 - 2:13 pm: | |
I added a short pickup tube, ran new lines, and used a low pressure fuel pump from Napa that is only activated when the genset is running. As for priming (what the orignal question was about), I was planning on adding a tee to the supply to the genset, and routing to a shutoff valve on the filter. That way if I do ever run out of gas because of stupidity, I can refill the tank, turn on the genset, which will prime the DD. |
Richard Bowyer (Drivingmisslazy)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Friday, April 22, 2005 - 4:48 pm: | |
I added a very inexpensive low pressure gasoline fuel pump from PepBoys. It was electronic as I recall. I only needed it for re-priming the genset if I broke the fuel system for some reason. I had it on a push to operate switch so that it only run when I was holding the switch. The built in fuel pump on the Wrico genset then took care of the fuel requirement after it was primed.
Richard |
Jim Bob
Rating: N/A
Votes: 0 (Vote!) | | Posted on Friday, April 22, 2005 - 6:05 pm: | |
I carry a good quality squeeze bulb marine fuel hose (no end fittings). I have replaced the pipe plug in the top of the DD primary filter with a hose barb and a 1/4 turn ball valve to prime the filter. I have never run the bus out of fuel but I have primed a dry system after removing & cleaning the tank & replacing the fuel filters all at once.
The squeeze bulb filled the lines & the primary filter in about 30 seconds. I pumped a little more fuel, filling the secondary filter which I then installed. Then I turned off the valve, removed the hose barb & install the plug in the valve for safety (in case the valve "wiggled" open). Bus started in a couple of revolutions.
When not priming the system, the hose & bulb makes a great siphon starter & can be used for many other fluids. If it wears out, I can buy another at Wally World for $14.
Simplicity = reliability. Works for me.
Jim-Bob |
TWODOGS (Twodogs)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Friday, April 22, 2005 - 7:17 pm: | |
what department at wally-world ?? |
James Maxwell (Jmaxwell)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Saturday, April 23, 2005 - 1:52 am: | |
Jim-Bob: In case you were implying that I suggested tapping the engine fuel line, I wasn't. My bus came equipped with two-side filling and dual pick-up and return ports. For the one p/u and rtn. capped off I installed a manifold system to the genset and eventually to a priming pump or ready source for some diesel fuel "cleaner". |