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??'s about running mechanical and electric fuel pumps #591304 01/23/10 12:11 AM 01/23/10 12:11 AM
Joined: Jan 2003 Posts: 1,771 Jamestown, Indiana J James74 OP top fuel
James74 OP top fuel J Joined: Jan 2003 Posts: 1,771 Jamestown, Indiana	plan is to swap a 440 into my 88 w150 this spring. It has an electric fuel pump from the factory. toying with the idea of keeping it, plus running the 440 mechanical pump. Both would just be stock, as the engine will be pretty mild. Should I just run one or the other? If I keep both, do you have to regulate the pressure before it gets to the mechanical pump? ( the electric is a tbi fuel pump). I originally planned to just use the electric, but now thinking about keeping both. Overkill and overcomplicated? comments, opinions, experience?

Re: ??'s about running mechanical and electric fuel pumps [Re: James74] #591305 01/23/10 12:25 AM 01/23/10 12:25 AM
Joined: Nov 2003 Posts: 36,041 Lincoln Nebraska R RapidRobert Circle Track
RapidRobert Circle Track R Joined: Nov 2003 Posts: 36,041 Lincoln Nebraska	Not sure if the TBI pump would put too much psi into the mech one. I think I'd toss it & just run a line from a sock up to a stock mechanical pump on the 440. If the TBI one will not be too much psi it would let you prime it after it sits for awhile which happens w todays gas and it would pretty much elim vapor lock live every 24 hour block of time like it's your last day on earth

Re: ??'s about running mechanical and electric fuel pumps [Re: RapidRobert] #591306 01/23/10 08:51 AM 01/23/10 08:51 AM
Joined: Jan 2007 Posts: 7,664 IN A ahy master
ahy master A Joined: Jan 2007 Posts: 7,664 IN	An in tank pump works a lot better with today's gas as posted above. The in tank pump picks up cool gas in the tank and immediatly pressurizes it which helps avoid vapor lock in hot weather. I would suggest keeping the electric pump with no mechanical pump. Add a regulator in the engine compartment to reduce pressure to around 5 psi for the carb. The mechanical pump won't add anything and may not like the higher pressure of the in tank pump at its inlet.

Re: ??'s about running mechanical and electric fuel pumps [Re: ahy] #591307 01/23/10 09:19 AM 01/23/10 09:19 AM
Joined: Jan 2003 Posts: 25,200 Upper Midwest M MoparforLife Too Many Posts
MoparforLife Too Many Posts M Joined: Jan 2003 Posts: 25,200 Upper Midwest	The high pressures that the fuel injection compatible electric tank pump will be putting out may in very short order rupture the diaphram in the mechanical pump and put gas into the oil pan without you knowing it till it is too late. I do not like to run any electric pump in conjunction with the mechanical pumps. IMO run with one or the other - not both.

Re: ??'s about running mechanical and electric fuel pumps [Re: MoparforLife] #591308 01/23/10 10:01 AM 01/23/10 10:01 AM
Joined: Jul 2007 Posts: 531 Virginia J JimG mopar
JimG mopar J Joined: Jul 2007 Posts: 531 Virginia	Quote: The high pressures that the fuel injection compatible electric tank pump will be putting out may in very short order rupture the diaphram in the mechanical pump and put gas into the oil pan without you knowing it till it is too late. I do not like to run any electric pump in conjunction with the mechanical pumps. IMO run with one or the other - not both.

Re: ??'s about running mechanical and electric fuel pumps [Re: MoparforLife] #591309 01/23/10 10:10 AM 01/23/10 10:10 AM
Joined: Nov 2006 Posts: 1,086 Baton Rouge, La. StandOnIt super stock
StandOnIt super stock Joined: Nov 2006 Posts: 1,086 Baton Rouge, La.	Quote: The high pressures that the fuel injection compatible electric tank pump will be putting out may in very short order rupture the diaphram in the mechanical pump and put gas into the oil pan without you knowing it till it is too late. I do not like to run any electric pump in conjunction with the mechanical pumps. IMO run with one or the other - not both. The mechanical pump wont last long at all due to internal rupture. You may be able to loop the fuel back to the tank right before the mechanical to keep the pressure off it and to keep clean and cool fuel right there at it. A little overkill I would think and alot of work for not really any gain of performance. You can always show it to ya buddys and make them think you're a genuis for comming up with something like this tho. Personally, I would regulate the electric. If the regualtor is gonna cost a little too much for ya, slam the mechanical on it and unhook the intank one. Check and make sure the mechanical will even pull fuel through it first. 76' Volare, 5.9 magnum w/Iron heads. New best 10.68 at 123 mph 1/4 mile.

Re: ??'s about running mechanical and electric fuel pumps [Re: StandOnIt] #591310 01/23/10 10:33 AM 01/23/10 10:33 AM
Joined: Jan 2003 Posts: 1,771 Jamestown, Indiana J James74 OP top fuel
James74 OP top fuel J Joined: Jan 2003 Posts: 1,771 Jamestown, Indiana	I was thinking it might be a bit overcomplicated, especially since the engine is pretty mild. Just thought I'd put it out there. Thanks for the replies

Re: ??'s about running mechanical and electric fuel pumps [Re: StandOnIt] #591311 01/23/10 10:46 AM 01/23/10 10:46 AM
Joined: May 2003 Posts: 15,487 Florida S scratchnfotraction I Live Here
scratchnfotraction I Live Here S Joined: May 2003 Posts: 15,487 Florida	good luck fitting that 440 in a 88 frame there is a reason the bouchillon BB swap kit only goes to 87 the 88 has diff mounting locations and frame shape under the engine I got an 88 frame out back and it wont bolt in,not saying you cant make it fit and work but bolting it in with stock mounts and all is not gonna work IMHO the tranz xmember is diff also I just put a 440/727 in an 85 frame and used all stock pieces to bolt it in just like factory remember also 2 wheel and 4x4 BB engine mounts are diff and wont swap out either,4x4 mount for 4x4 only ect.. yea use the pump in the tank with a dead head reg at the carb or use one with a return line that can be bypassed and made work with the key..pcm controls sux.. I used my 88 cab and swap the whole wireharness to an 85 wireharness to get rid of the tbi wireharness and the pcm that runs the alt charging and fuel pump stuff bypassing and running the alt and pump is not that hard to do but I dont do to much wireing myself so went with the 85 harness to make it mucho easy good luck

Re: ??'s about running mechanical and electric fuel pumps [Re: scratchnfotraction] #591312 01/24/10 07:23 PM 01/24/10 07:23 PM
Joined: Jan 2003 Posts: 1,771 Jamestown, Indiana J James74 OP top fuel
James74 OP top fuel J Joined: Jan 2003 Posts: 1,771 Jamestown, Indiana	Quote: good luck fitting that 440 in a 88 frame there is a reason the bouchillon BB swap kit only goes to 87 the 88 has diff mounting locations and frame shape under the engine I got an 88 frame out back and it wont bolt in,not saying you cant make it fit and work but bolting it in with stock mounts and all is not gonna work IMHO the tranz xmember is diff also I just put a 440/727 in an 85 frame and used all stock pieces to bolt it in just like factory remember also 2 wheel and 4x4 BB engine mounts are diff and wont swap out either,4x4 mount for 4x4 only ect.. yea use the pump in the tank with a dead head reg at the carb or use one with a return line that can be bypassed and made work with the key..pcm controls sux.. I used my 88 cab and swap the whole wireharness to an 85 wireharness to get rid of the tbi wireharness and the pcm that runs the alt charging and fuel pump stuff bypassing and running the alt and pump is not that hard to do but I dont do to much wireing myself so went with the 85 harness to make it mucho easy good luck thanks for the heads up! Checking out BPE's website they mention that the kit won't work with 88-93 v-6 trucks. Maybe v-8 trucks are different?

Re: ??'s about running mechanical and electric fuel pumps [Re: James74] #591313 01/24/10 11:24 PM 01/24/10 11:24 PM
Joined: May 2003 Posts: 15,487 Florida S scratchnfotraction I Live Here
scratchnfotraction I Live Here S Joined: May 2003 Posts: 15,487 Florida	mine had a 5.2 318 v-8 the v-8 had one bolt in motor mount on driver side for v-8 and another for v-6 IIRC no frame xmember where the BB motor mount would sit and bolt up you could fab up some mounts out of flat stock I geuss IMHO,I dont think it will "just" bolt in with that frame and tranny xmemeber change in 88

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