| Need suggestion on fuel injection fuel pump [message #310189] |
Thu, 10 November 2016 09:14  |
Bob S.
Messages: 143
Registered: October 2012
Location: Rapid City, SD
Karma: 2
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Hello everyone, Recently I have been helping a newbie get a coach running that has been setting for 7 years. The new owner is temporarily overseas and we have been communicating frequently with questions that he has. He has decided to replace the quadrajet with FItech fuel injection and is wondering what type of fuel pump set up he should use. I have the FItech on my coach and have a low pressure fuel pump in each tank and a high pressure frame mounted inline pump. I'm not sure he needs all the redundancy. I am hoping to get the opinions of those that know way more than I do. A little more information on the coach it is a 78 Birchhaven with actual documented 23,000 miles. It has the 403 with the original distributor. Any and all help is greatly appreciated. I am also encouraging the new owner to join this community. Hopefully that will happen soon. Thanks in advance for your help. By the way, I love my FITech system.
Bob and Pam Schilling
Rapid City, SD
"78 Royale
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| Re: Need suggestion on fuel injection fuel pump [message #310194 is a reply to message #310189] |
Thu, 10 November 2016 10:18  |
Larry
Messages: 2875
Registered: January 2004
Location: Menomonie, WI
Karma: 10
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Senior Member |
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Bob.
I like the redundancy that you noted for a number of reasons. Pumps in the tanks are...IMO...the best way to reduce the potential effects of vapor lock. Put pumps in the tanks and you always have a back-up with the switch on the dashboard should one or the other pump give out. While the tanks are down for that upgrade, put steel line from the tank to the frame and you may never have to take the tanks down again. Personally I do not like the frame mounted high pressure pump. They can be very noisy especially in warm/hot weather. (just my experience). i have the high pressure pumps in the tanks and fuel pressure regulator mounted on the frame just in front of the reserve tank, with return fuel to the reserve tank drain plug, all steel line up to the engine, and a short piece of rubber ethanol resistant fuel injection hose between the frame and the engine to allow for engine torque movement. I put the regulator back at the tank so that fuel would not travel to the engine, get heated up from engine heat and then return hot gas to the tank...only exacerbating potential vapor lock. Fuel comes out of the tank under high pressure, goes though the regulator, with excess fuel going directly back to the tank cold, not traveling more than 4 or 5 ft. IMO always return the excess fuel to the reserve tank. That way you always know what you've got for fuel reserves.
Just my relatively informed, off the cuff, back yard mechanic, gut level, eyeball it up and guestimate, opinion....that's all...
Larry 
78 Royale w/500 Caddy
Menomonie, WI.
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