Hello All I am in need of so desperate help. I have a 1997 Daymon daybreak with the Chevy 454 motor. We are having an issue with loss of power . We changed the fuel filter, checked the Airfilter, performed a tune up, checked for vacuum leaks and engine codes with no luck . The unit stumbles and hesitates (worse when it's cold) apon acceleration . It has no power up hills however we can get to 65mph plus on flat ground. Does anyone have any ideas as to what I might try . Thanks for all the help in advance

Sounds like a fuel pump....it starves upon hard acceleration and hill climbing, but provides enough fuel for gentle acceleration and flat road driving.

DSDP Don wrote:Sounds like a fuel pump....it starves upon hard acceleration and hill climbing, but provides enough fuel for gentle acceleration and flat road driving.X2

Hello Thanks for the info . When it's cold even when I first step on the gas it does stumble . It does seem to get better once the engine is warm . I am pretty sure the engine even popped couldn't tell if it was exhaust or intake . It only did this when it was cold though

Also is there a way to test the fuel pump to determine it is indeed bad before we drop the tank ? If so what psi or something should Inbe looking for and how to test it?

Also the guy working on it for me says the fuel has an odd smell to it ?

1997 Daymon Daybreak no power need help | Good Sam Community

ashlatz
Explorer
Apr 08, 2016
Well good news new fuel pump is in . Tested at the line and we are at 60psi. Test drove last night and all appears to be good . Good use some injector cleaner but other wise much better . Thanks for all the help .
Gjac
Explorer III
Apr 04, 2016
RLS7201 wrote:
Gjac wrote:
ashlatz wrote:
Ok performed test on rail . It is reading 30psi . When we shut off it did leak down 2psi in about 2 minutes ?
You said in your above post that you had throttle body injection(TBI). Chevy switched to direct fuel injection in 1996. But you could have an older chassis with a TBI which will have lower fuel pressure. If you remove the air cleaner and you see a two fuel jets and see gas squirting out off each jet when you step on the gas you have a TBI. Just something too make sure off before you drop the tank.

The OP got it right. Note he said he performed the test on the "RAIL".

Richard
Your right my 1996 does not have the rail.
DSDP_Don
Explorer
Apr 01, 2016
Thanks for keeping us up to date. It's nice when the Forum memebers try and diagnose an issue and the OP comes back with what worked. It also helps others with a similar coach and issues.
ashlatz
Explorer
Apr 01, 2016
Well We are in the process of putting a new fuel pump . Figures crossed that this fixes it I will keep everyone posted
RLS7201
Explorer II
Apr 01, 2016
Gjac wrote:
ashlatz wrote:
Ok performed test on rail . It is reading 30psi . When we shut off it did leak down 2psi in about 2 minutes ?
You said in your above post that you had throttle body injection(TBI). Chevy switched to direct fuel injection in 1996. But you could have an older chassis with a TBI which will have lower fuel pressure. If you remove the air cleaner and you see a two fuel jets and see gas squirting out off each jet when you step on the gas you have a TBI. Just something too make sure off before you drop the tank.

The OP got it right. Note he said he performed the test on the "RAIL".

Richard
Gjac
Explorer III
Apr 01, 2016
ashlatz wrote:
Ok performed test on rail . It is reading 30psi . When we shut off it did leak down 2psi in about 2 minutes ?
You said in your above post that you had throttle body injection(TBI). Chevy switched to direct fuel injection in 1996. But you could have an older chassis with a TBI which will have lower fuel pressure. If you remove the air cleaner and you see a two fuel jets and see gas squirting out off each jet when you step on the gas you have a TBI. Just something too make sure off before you drop the tank.
ashlatz
Explorer
Apr 01, 2016
Hello Yes we plan to put a good fuel pump in it . As anyone heard of the fuel pressure regulator as a possible cause too and should I just replace that too or just start with the pump!
ashlatz
Explorer
Mar 31, 2016
Oh yeah plan too put a good one in . Would the regulator possibly cause this too and should I consider replacing both ?
DSDP_Don
Explorer
Mar 31, 2016
Sounds like you found your problem. I would buy an OEM fuel pump and not look for some aftermarket bargain. You don't want to drop the tank twice.
ashlatz
Explorer
Mar 31, 2016
Ok performed test on rail . It is reading 30psi . When we shut off it did leak down 2psi in about 2 minutes ?

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1997 Daymon Daybreak no power need help

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