| IN-TANK FUEL PUMPS [message #242473] |
Thu, 06 March 2014 10:33  |
corleyw
Messages: 130
Registered: June 2007
Location: Battle Ground, WA
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Rob posted this in the nylon fuel lines forum, (but of course it has little or nothing to do with nylon fuel lines), which got me thinking about in-tank fuel pumps, and which would be ideal and why. Please try to keep this on topic, and only discuss "in-tank pumps" as much as possible.
Rob recommends a low pressure in-tank pump (3 psi), and has several reasons to justify that choice. If one is sticking to the Q-jet, that would seem like a pretty good choice. However, if one is contemplating eventually going to EFI, then you may feel a higher pressure pump is in order. GM mid '80s - mid '90s TBI EFI systems as used on a 454 Chevy truck, used a 12 psi in-tank pump. With Rob's suggestion, you would have to add an additional external pump to go to TBI EFI. As I understand it, other EFI systems use even higher pressure pumps, many in the 40 PSI range. Maybe it would make more sense to install a higher pressure pump to start with, then add a regulator as needed to get the proper pressure for the Q-jet, if that was retained? Maybe you feel as Rob does that the lower pressure in the lines is a good thing, or maybe you feel that a higher pressure in the lines would be a better protection against Vapor lock. That's the sort of thing we'd like to know...
For this discussion, let's assume:
1) Two in-tank pumps
2) A return line
3) A Q-jet for now, with possible future upgrade to TBI EFI
4) Price is not much of a factor (but don't recommend a Newmar diesel pusher)
The question then is, what pumps would you install, and why? If you have any specific part numbers, any pictures you can supply, etc., that would also be welcome information. The mechanics of vapor lock have been beat to death, so please try to avoid rehashing all that crap.
I've copied Rob's post here to kick things off. 
Corley
'76 Glenbrook
29 other vehicles
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