CDA 455
3/4 ton status
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Last edited:
CK5
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Ram Jet 502 Fuel System Set Up
- Thread starter CDA 455
- Start date
pauly383
Daddy383
Too bad that doesn't have a mechanical pump boss 
Quick Fuel makes a mechanical pump that will flow 70 psi before regulation , just for injection .
Quick Fuel makes a mechanical pump that will flow 70 psi before regulation , just for injection .
mrdrinksalil
1/2 ton status
Why dont you just run what you have with an inline pump?
Just for clarification, your return line is what GM used to prevent vapor lock. Your pump should be as close to the tank as possible, so it should be away from major heat sources, if external. Again running a return line will help to keep it cool as well, just not as much as an internal.
Can't answer high pressure external answer, but I can say that a few people run without baffles and don't mention any problems as long as they keep it over 1/4 tank. Kind of a pain I think, but makes for an easier solution. With a 502 that may be impractical.
Can't answer high pressure external answer, but I can say that a few people run without baffles and don't mention any problems as long as they keep it over 1/4 tank. Kind of a pain I think, but makes for an easier solution. With a 502 that may be impractical.
I'll just stand in the back with a bilge pump... 
heck, if you're gonna drop that much coin in a mill, might as well have a tank made. It's not that much money...
Tis true, but if there's a late model one that I can simply swap in, that would be cheaper yet appropriate without compromising.
When I had a Tune port setup I used the exhisting tank with external Walbro pump and used the Blue Flexible fuel injection hose from jegs to run a supply and a return. I took out the fuel filler pipe out and welded a nipple in it for a return point.
Lots of people make aftermarket pumps for LS1 applications. Read a little on the LS1tech forums. Otherwise you can source pretty much any late model in-tank pump unit. Be warned though, they're very expensive and come as a unit. You can't buy just the pump. It's the whole pump/sender/etc. unit.
Yep, pretty much anything with a Vortec runs the pressures that you need. If you want to spend the coin and go that route, I would suggest looking up a truck with an 8.1. That way you know it will feed at least 496 cubes.
The '87-91 blazer tanks will fit in the first gen, but I don't consider them very practical because they are big and hang down quite low.
Most of the time I just install an inline pump and reuse the stock tank. I have done this on numerous F.I. conversions with ZERO issues, one of the conversions makes over 500 horsepower, most average around 400 horse.
Your Blazer will have provisions for a return line already. You'll just need to use the line that originally went to the charcoal canister, it'll require some clean up and replacing the rubber fuel lines but no big deal.
The only other option is to have tank made, expect to spend over a grand with the correct pump and sender.
Most of the time I just install an inline pump and reuse the stock tank. I have done this on numerous F.I. conversions with ZERO issues, one of the conversions makes over 500 horsepower, most average around 400 horse.
Your Blazer will have provisions for a return line already. You'll just need to use the line that originally went to the charcoal canister, it'll require some clean up and replacing the rubber fuel lines but no big deal.
The only other option is to have tank made, expect to spend over a grand with the correct pump and sender.
