The Stovebolt Site Forums The Shop Area Engine Shop vacuum style fuel pump vrs regular fuel pump

can i just replace the fuel pump with the vacuum line with a non vacuum line fuel pump without any problems (other than the wiper function)?
if i do use a vacuum style fuel pump (the one with the 2 vacuum hose attachments) can i just cap them off with any problems ?
seems like the reg. fuel pump (non vac) is not filling my see through gas line filter. its acting kind of peeyouny.
could the cam lobe be flat - does that happen to 235's ?
anyway i got one of each fuel pump.
if there are no issues with the old style pump i'll use it !
any thoughts ?
thanks
paul

the fuel pump is to get fuel to the carb. the other funtion is to boost the vacum to the wiper motor. so the ? is elec. wipers are the way to go. then the fuel pump is pumping fuel. I am no exprert but is has been my expriance vacum wipers suck. vac.ast. wipers suck.so fuel pumps pump fuel. elec.wiper motors power wipers. there is a reason modern cars have spearated the systems.it is 6 of one,or a half dozen of the other. if you get your vac. wipers to work good let me know. god know i've tried.I dont want to sound like a smart [censored] or know it all. but I converted mine and never looked back. so that is my humble thoughts on the matter.

I wouldn't trade my vacuum wipers for all the electric ones you could haul on a container ship. Mine have at least 500 speeds vs electric one or two speed or possibly three. They are also intermittent at ANY interval needed. I use a Mercedes diesel 12v vacuum pump ($20 at pic-a-part) mounted under the cab with a vacuum line run up through the factory firewall grommet. I send the motor to Ficken to rebuild and then drive it 30 years trouble free, uphill-downhill, loaded or not, or pulling a loaded trailer they will run at ANY speed I desire. I think the filtered contaminate free vacuum from the pump is better than the engine vacuum which could polute the pump innards when the engine spits back for any reason.

I think y'all are dodging the actual question. paul is asking which one would be better for pumping feul. I don't think it would really make any difference which pump is used. With the preblem described, i would suspect a flat lobe, worn pump arm, or potentially an internal pump issue, such as a bad seal or ruptured diaphragm. Since you have both styles of pump, it won't hurt to try the vacuum assist style and see if it makes any difference.
edit, if there is no difference, then there is another issue beyond the pump, such as the mentioned cam lobe, but also potentially something restricting the line from the tank.

thank you coilover that is the reason for the forums I did not have any luck with vac. wipers.I am familar with diesel engs. and vac.assist alts. I never thought to marry them up.as I'am old school 6 volt gen. so please post pics and tec info if you please. I'am the new guy,any info is good info,your input will be well recived.did not mean to step on any toes. thanks floyd

If not filling the see through filter is your only problem don't worry about it. For some reason they are all like that. If the vacuum wiper motor is good I would use it. If you have to pull it I would go back with an electric. You can use a vacuum reservoir with it if you want to use the sigle pump.