might be a moot point with the pump i found but the question still remains :D Having several vintage Ford Broncos and my motorhome being a E350 w/460 chassis i always kinda wondered if i could rig up a test system that would feed fuel in at the schrader valve in the event of a pump failure. The pres reg is on the rail near the valve and, as said, it the factory pump is check valved i would think it should work fine in an emergency. Again I'm mainly thinking in an emergency and truth be told its my motorhome I'd like to have a rig for, its a mid 90's Jamboree Searcher and its only got 50K on it but accessing the pump is near impossible. I would just like to have a contingency on hand. It would actually be pretty simple the pump for the gen could easily be used to pre-feed the high pressure emergency pump and from there would be about a six foot custom made stainless line with the shrader fitting on it. As a bonus it could be used with my Broncos for test purposes.


I dont recall where i got the pump i fund but its part number comes back a low press small Merc motor of some sort.

this is the number on it 861155-4 2025a

I worked in a tune up shop many moons ago and we had a roll-around machine that had a fuel pump and a reservoir built in we would fill with straight fuel inj cleaner. For fuel inj cleaning service, we would connect it to the schrader valve (after disabling the main fuel pump) and run eng at a fast idle for abt 20 mins. We would set the machine's fuel press low enough that it wouldn't bypass the regulator. So it can be done. If it should be done is another matter. A leak at that point could be disastrous.

You mentioned low press in your last post.. If it's made for a carb (6-8 psi), I doubt if it will work at all on a port inj eng (40-50 psi) but might barely work if eng has throttle body inj (10-15 psi generally).
Another issue is when you connect to the schrader valve, you're bypassing the filtration process. It doesn't take much to plug an injector, especially a port injector. 1 cyl goes lean while you're climbing a hill, eng goes boom.

If it turns out to be a carb type pump, you could always use it to de-fuel various types of fuel tanks.

yes i mentioned the pump i ran across was found to be a low press pump, i was no longer considering that particular pump and would locate a suitable in-line type 40-50 psi pump if i do decide to build a rig. I understand the safety implications fully, this would be strictly for getting off highway or something like that. I've actually built several GM based FI systems from scratch back in my street rod days so i understand much of the system (the hardware anyway). Good point though that this would be down stream of critical filtration, i suppose that being said i could improve my gens feed line but even still you are correct any little particle could be an issue. Most of this is just a thought that had been rolling around in my head as i really do like to be prepared for just about anything. On low psi carb stuff I've always kept an in line elec pump, which ironically has been used by several friends to get back to port but never once by me lol same with spare water pump impeller kits cant tell you how may of those i handed out :D